If Mathew was an eyewitness, why would he need to use Mark?

Introduction

A common objection raised in New Testament studies centers on the Synoptic Problem: If Matthew was an apostle and direct eyewitness to the ministry of Jesus, why would he rely so heavily on the Gospel of Mark as a foundational source? To modern readers accustomed to 21st-century copyright and authorship norms, borrowing material might seem like an admission of secondhand knowledge. In the ancient world, however, Matthew’s use of Mark was not a shortcut; it was a deliberate literary, historical, and theological strategy. The Gospel of Mark is essentially the memoirs of the Apostle Peter. Early church fathers, such as Papias (c. 125 AD), recorded that Mark served as Peter’s interpreter and wrote down his preaching accurately.

Peter’s Apostolic Authority

To understand why an eyewitness like Matthew would rely on Mark’s account, one must first recognize the apostolic authority embedded within Mark itself. Far from being a detached, secondary summary, the Gospel of Mark was understood across the early Church as the direct memoirs of the Apostle Peter. As early church historian Papias of Hierapolis recorded around 125 AD, Mark served as Peter’s interpreter, carefully preserving the sermons and recollections of the chief apostle. Peter belonged to Jesus’ innermost circle, witnessing pivotal moments - such as the Transfiguration, the raising of Jairus’ daughter, and the agonizing prayer in Gethsemane - that Matthew himself did not directly see. By incorporating Mark’s text, Matthew was not outsourcing his own memories, but anchoring his Gospel to the foundational preaching of Peter, which was already recognized and revered across early Christian communities.

Ancient Historiography

Furthermore, Matthew’s reliance on an existing framework aligned directly with first-century historiography. In ancient Greek, Roman, and Jewish literature, the goal of a historian was not to present an isolated, novel account, but to demonstrate continuity, consensus, and reliable sourcing. Adopting and expanding upon an established chronicle was considered the gold standard for verifying historical facts. By aligning his narrative sequence with Mark’s widely circulating work, Matthew corroborated the apostolic message, demonstrating to his readers that the testimony of the Twelve was unified and consistent.

A Different Theological Purpose

At the same time, Matthew’s specific audience required a radically different theological and pastoral emphasis. While Mark penned a concise, fast-paced narrative tailored largely for a Roman Gentile readership, Matthew composed his Gospel for Jewish Christians grappling with Mosaic Law, temple traditions, and the Messianic promise. To speak directly to these concerns, Matthew expanded Mark’s skeletal framework with over sixty Old Testament citations to prove Jesus as the promised Davidic King. He integrated extensive blocks of teaching—most famously the Sermon on the Mount—to present Jesus as the New Moses and provide a complete manual for discipleship, while also inserting the legal genealogy of the Messiah and unpacking intricate debates surrounding Torah observance.

Finally, the substantial verbal overlap between Matthew and Mark can also be attributed to a shared, highly structured oral tradition. Prior to the widespread circulation of written scrolls, the apostles spent decades in synagogues and house churches repeating standardized summaries, parables, and sayings of Jesus. In an oral culture practiced in rabbinic memorization techniques, this stabilized reservoir of communal preaching naturally produced parallel wording. This ensured that whether through Mark's parchment or the shared oral catechism of the early Church, the apostolic testimony remained coherent and unified.

TL;DR

Even as an eyewitness, Matthew had clear historical, apostolic, and pastoral reasons to use Mark: 1) Mark preserved the memoirs and preaching of Peter carried immense weight across early churches. 2) In ancient historiography, building upon an existing, credible account demonstrated continuity and apostolic consensus rather than idiosyncratic reporting. 3) Mark wrote a brief narrative for a Gentile audience, whereas Matthew expanded that shared framework for Jewish Christians, adding Jesus' detailed discourses, legal genealogies, and extensive Old Testament fulfillment proofs.

Far from undermining Matthew’s apostolic credibility, his integration of Mark’s Gospel demonstrates the unity of early apostolic preaching. Utilizing Peter’s core memoirs allowed Matthew to anchor his account in the shared testimony of the Twelve, while leaving him ample room to enrich the narrative with the rich Messianic proofs, detailed discourses, and Jewish context essential for his readers.

How Can the Gospels Be Reliable If They Are Interdependent

Introduction

A common objection to the historical reliability of the New Testament is literary interdependence: if Matthew and Luke drew upon Mark or shared source material, skeptics argue they cannot function as independent, trustworthy witnesses. However, evaluating the Gospels through the lens of ancient historiography turns this objection on its head. In the Greco-Roman world, utilizing reliable prior sources, interviewing eyewitnesses, and synthesizing established oral tradition was the gold standard of careful historical biography - not a sign of collusion. Far from undermining the text, the dynamic interplay of shared material and distinct, unique eyewitness perspectives demonstrates rigorous reporting anchored in historical reality.

Key arguments for the Gospels' reliability despite interdependence include:

Standard Ancient Practice: 

In the ancient world, it was standard practice for authors and biographers to utilize existing written and oral sources without modern-style footnotes or quotation marks. The Gospel writers were following the literary conventions of their time. Oral traditions were a primary means of transmitting stories and information for centuries before and alongside written texts. Authors like Herodotus and Thucydides explicitly mention traveling and interviewing local sources or eyewitnesses, ala Luke.

Focus on Information: 

The overlap demonstrates that the authors were interested in reporting information, and they believed their sources (like Mark and the hypothetical "Q" source, which many scholars believe contained Jesus' sayings) were information-based and trustworthy.

Independent Access and Unique Material: 

If Matthew and Luke used Mark and other common sources, each Gospel also contains significant material unique to its author, suggesting they had access to independent sources and eyewitness accounts. 

• Matthew - unique stories:

1. The visit of the Magi (the "Three Wise Men").
2. The flight into Egypt.
3. The Parable of the Pearl of Great Price and the Parable of the Talents.
4. The account of the temple tax being paid with a fish's mouth coin.

• Mark - unique stories:

1. the mention of a young man who flees naked when Jesus is arrested (Mark 14:51-52)

• Luke - unique stories:

1. The Parable of the Good Samaritan.
2. The Parable of the Prodigal Son.
3. The birth narrative from Mary's perspective, including the Magnificat and the visit of the shepherds.
4. Stories like the healing of the ten lepers. 
5. The encounter with the tax collector, Zacchaeus.

• John - unique stories:

1. The prologue about the Word (Logos) who became flesh.
2. Several extended discourses and private conversations of Jesus, rather than short parables.
3. Specific miracles (often called "signs") such as turning water into wine and the raising of Lazarus.

Eyewitness Vetting: 

The Gospels were written early enough (within living memory of the events) that eyewitnesses were still alive and could have vetted or disputed the accounts. See The Early Dating of the New Testament.

Complementary Perspectives: 

The different Gospels were written for different audiences with specific emphases. Their minor differences in circumstantial details are seen as complementary perspectives that provide a richer, more complete picture of Jesus' life, similar to how multiple biographies of one person today would each highlight different aspects.

• Matthew: Written for a Jewish audience, it emphasizes Jesus as the promised Messiah, connecting his life and teachings to Old Testament prophecies.
• Mark: Primarily for a Gentile (Roman) audience, it presents a fast-paced account that highlights Jesus's powerful deeds and action, portraying him as a servant.
• Luke: Written for a Greek-speaking audience, it focuses on Jesus's perfect humanity and compassion for all people, including the weak, suffering, and outcasts.
• John: Written for a more universal audience, it emphasizes Jesus's divine nature and eternal existence, using "signs" to prove he is the Son of God.

Undesigned Coincidences: 

Some scholars point to "undesigned coincidences" (subtle details in one Gospel that unexpectedly fit with a detail in another without seeming planned) as evidence that the accounts are rooted in real events and not a coordinated fabrication. See Undesigned Coincidences Between Gospels

In essence, the shared material points to a common core of information and tradition, while the differences indicate independent authorial control and additional, distinct sources

Conclusion

Ultimately, literary overlap and historical credibility are not mutually exclusive. The Gospel writers did what any responsible ancient biographers would do: they respected and preserved authoritative source material while integrating their own independent access, eyewitness testimony, and distinct theological emphases. The shared foundation reflects an unwavering commitment to a common historical core, while the unique narratives, differing audiences, and subtle undesigned coincidences confirm genuine authorial freedom. Interdependence does not weaken the testimony of the Gospels—it reveals a robust, multi-layered historical record rooted firmly in living memory.

Undesigned Coincidences - Hidden Connections That Authenticate the Gospels

Introduction

When skeptics analyze ancient texts, they often look for signs of collusion or literary fabrication. Yet one of the strongest hallmarks of authentic eyewitness testimony is something far more subtle: "undesigned coincidences." These occur when one writer raises a question or mentions a casual detail without explanation, and a completely different writer - writing independently and in a totally different context—effortlessly provides the missing piece. These connections aren't trumpeted or highlighted; they simply lock together naturally, revealing an underlying bedrock of real history rather than coordinated fiction.

An Analogy

Imagine two unrelated witnesses giving statements after a morning commute. The first mentions seeing a neighbor briskly walking on a road in a sharp business suit on a Saturday morning - an odd, unexplained detail. The second witness, a store manager in that same shopping plaza, happens to mention interviewing that very neighbor for a management position at 9:00 AM, who had mentioned that his car broke down on the way.

Neither witness coordinated their story, and neither set out to explain the other’s statement. Yet the pieces interlock seamlessly: the interview explains the suit, and the walk explains the timing. When historical accounts fit together like interlocking puzzle pieces that neither author consciously designed to match, it’s the unmistakable fingerprint of a shared reality.

Undesigned coincidences are subtle, unintentional points of connection between two or more Gospel accounts that suggest an underlying historical reality, rather than a fabricated or colluded story.

Undesigned coincidences are like when a glove fits a hand perfectly, except the person making the glove didn’t mean to make it for the person it fits. Two independent sources subtly help explain details from one another seamlessly.

It’s the sort of evidence you would expect to see when two sources are based on eyewitness accounts. One account of an event omits a piece of information which is filled in by another account in a seemingly unintentional fashion.

An Example of an Undesigned Coincidence 

Sarah says she saw Bob walking to the shopping center in a suit on a Saturday morning. Taylor, who works in the shopping center, tells you she interviewed Bob for a sales job on Saturday morning.

The distinct details each witness gives subtly help explain why Bob was wearing a suit and why he went to the shopping center. The more instances of these coincidences we have, the less likely intentional fabrication becomes.

Here are several examples of undesigned coincidences in the Bible:

MENDING NETS

James and John were mending their nets (Matt. 4:21) when Jesus called them to follow him. Luke explains Jesus’ miracle catch of fish was breaking their nets (Luke 5:6) before they left everything to follow Jesus (v. 10–11), yet Matthew does not mention this miraculous catch.

The Healing at Peter's House

Matthew 8:16 states that in the evening, people brought the sick and demon-possessed to Jesus to be healed.

Mark 1:21 and 29-32 clarifies why they waited until the evening: the event happened on the Sabbath, and the people would have waited until the Sabbath ended at sundown to bring their sick, as public healing was controversial on the Sabbath. Mark's casual mention of the Sabbath is not presented as an explanation for Matthew's timing, but it fits perfectly.

The Feeding of the 5,000

Mark 6:39 mentions that Jesus commanded the people to sit down on the "green grass", an seemingly insignificant detail.

John 6:4 casually notes, in a different context within his narrative, that the miracle occurred around the time of the Passover festival. Passover happens in the spring (March/April), the only time of year when the grass in that region would be green after the winter rains.

John 6:5 records Jesus asking Philip where they should buy bread. One might wonder why Philip was singled out.

Luke 9:10 (in the context of the same event) and John 1:44 (in an unrelated passage) provide the answer: the miracle took place near the town of Bethsaida, which was Philip's hometown. Jesus naturally turned to the disciple with local knowledge.

Herod Antipas' Information Source

Matthew 14:1-2 recounts Herod the tetrarch hearing about Jesus and telling his servants that Jesus must be John the Baptist raised from the dead, showing his anxiety. It raises the question of how Matthew would know what was said in Herod's private conversation.

Luke 8:3 provides a potential explanation in an unrelated list of Jesus' female followers: one of them was Joanna, "the wife of Chuza, Herod's household manager". Joanna could have been an internal source of information from Herod's palace.

The Dispute Among the Disciples and the Foot-Washing

Luke 22:24 describes a dispute among the disciples during the Last Supper about which of them was the greatest. Jesus uses this occasion to teach a lesson on humility and servant leadership.

John 13:4-15 describes the seemingly spontaneous event of Jesus washing his disciples' feet during the meal. John doesn't mention the dispute, and Luke doesn't mention the foot-washing, but together, the foot-washing serves as a powerful, practical demonstration of the exact lesson Jesus was teaching in response to their argument in Luke.

Mary and Martha

In Luke 10:38-42, we get the famous story of Jesus visiting Mary and Martha of Bethany. Martha, the practical sister, is trying to get the house in tip-top shape for Jesus and becomes annoyed at her sister Mary, the emotional sister, who is just sitting at Jesus’ feet. 

Over in John’s Gospel (ch. 11), Jesus comes to see the same sisters because their brother Lazarus has died. John says that Martha immediately ran to Jesus, while Mary “remained seated in the house” (John 11:20). Martha welcomes Jesus, while Mary sits. Martha tells Mary that Jesus is calling to her, and only then does she rise. 

But instead of going to weep at the tomb, as the others expect (11:31), she “fell at [Jesus’] feet” (11:32) in a striking parallel to Luke. Mary is recorded as weeping, while Martha is not. Once they get to the tomb, Jesus asks for the stone to be rolled away, and the ever-practical Martha points out that “by this time there will be an odor, for he has been dead four days” (11:39). 

In short, these two sisters show consistent character traits in two completely different stories that do not refer to each other. The most simple explanation for this is that both authors are writing about real women.

The Sons of Thunder

Mark 3:17 tells us that James and John, the sons of Zebedee, were nicknamed “the sons of thunder” by Jesus. Mark never explains why Jesus would give these two such a memorable sobriquet. However, Luke’s gospel tells the story of Jesus being rejected by the Samaritans because he is a Jew on his way to Jerusalem. Luke continues: “And when his disciples James and John saw it, they said, “Lord, do you want us to tell fire to come down from heaven and consume them?” But [Jesus] turned and rebuked them” (9:54-55). 

So just as Luke 9 helps illuminate characters from John’s Gospel, so does Luke 10 help explain a reference in Mark’s Gospel. It’s highly unlikely that Luke would have invented two different stories to explain the motivations of characters in two other gospels, especially since John was almost certainly written later. The simpler explanation is, once again, that both are talking about real incidents with real people.

The Transfiguration

Upon coming down from the mount of transfiguration, Luke’s gospel tells us that the disciples “kept silent and told no one in those days anything of what they had seen” (Luke 9:36). But why? Wouldn’t you tell somebody if the rabbi you were following starting glowing white and had a conversation with Moses and Elijah? Luke provides no answers. 

Thankfully, Mark does in his account of the transfiguration: “And as they were coming down the mountain, [Jesus] charged them to tell no one what they had seen, until the Son of Man had risen from the dead” (Mark 9:9). 

So the reason they were silent is that Jesus had commanded them to be (something Mark never fails to mention). Maybe Luke knew about Mark’s story and didn’t feel a need to repeat this tidbit. Perhaps, but that only goes to show that he was not just copying Mark’s account. He is providing independent verification of the same event.

Pilate's interrogation 

In Luke 23:1-4, Pilate asks Jesus whether he is a king, and Jesus gives an answer that is certainly not a denial and that many scholars take for a terse, idiomatic acknowledgement. Then Pilate declares that he finds him innocent. How can this be explained? Answer: Luke is giving only a summary of the interview. In a fuller account, we discover that Jesus told Pilate that His kingdom was not of this world. (John 18:36)

Also, in John 18:32, Pilate asks Jesus whether he is a king. What prompted that question? (Nothing earlier in the chapter indicates that this was a charge leveled against Jesus.) Answer: Though John does not record it, the Jews did make that very charge against Jesus. (Luke 23:1-2)

An Accusation at the Cross

Mark records that people who saw Jesus on the cross derided him by saying, “Aha! You who would destroy the temple and rebuild it in three days, save yourself, and come down from the cross!” (Mark 15:29-30). Yet nowhere in Mark (or Matthew or Luke, for that matter) does Jesus make this claim. It seems to come out of nowhere. 

But in John, in a different context entirely, we see the Jews ask Jesus for a sign, and he replies, “Destroy this temple, and in three days I will raise it up” (John 2:19). John goes on to explain that Jesus was speaking metaphorically about his body being resurrected, but the metaphor was obviously lost on the crowd. Again, John clearly did not put this story in his gospel to explain the crowd’s cries in the synoptic gospels, but it unintentionally does so.

Conclusion

These subtle interconnections, spanning different narratives and contexts, are viewed as powerful evidence that the Gospel writers were relaying accounts of real events they had witnessed or heard from reliable sources, rather than coordinating a fictional story.

It's highly unlikely that later fabricators from all different parts of the world, decades after Jesus, tie each other’s loose ends up so neatly in such a subtle fashion if the recorded narratives were completely disconnected from the historical events? It’s far more likely the Gospel authors were referring to eyewitness history, and not making up history. 

 

Beyond Literary Dependence: The Real Numbers Behind Synoptic Agreements

Did the Gospel Writers Really Copy Each Other? The Raw Data Says No

Introduction

Skeptics and critical scholars often assert that the Synoptic Gospels - Matthew, Mark, and Luke - are little more than a chain of literary copycats. However, placing the Greek texts side by side reveals a very different reality: exact verbatim agreement across all three accounts is vanishingly rare. When you look strictly at identical matches, the overlap shrinks to just 17 verses and 306 words - less than 0.1% of the entire Synoptic corpus, with the vast majority consisting of direct quotes from Jesus or the Old Testament. Rather than proving direct, word-for-word literary dependence, the data points to genuine independent testimony, rooted in strong oral tradition and shared historical memory.

The truth is that the verbatim agreement between Matthew, Mark, and Luke isn’t much. I remember years ago reading the synoptics side by side and noting there was some agreement - but not enough that would make me say, “they’re copying one another”.


If one has ever read a parallel Bible, this is plainly obvious. One goes, page after page, without seeing any verbatim matches. Read through a portion of text that is found in three or all four of the Gospels - start here on page 22. You can flip the page to read it in landscape for easier reading - and carefully compare exactly what each writer is saying.


You will see the same story, but in a slightly different sequence, with slightly different statements where the author either added or omitted certain details. These details do not change the story, but they do tell us that we are reading four separate, independent accounts by four separate writers who all saw the same events or talked to those who did. Though there may be some evidence of a Q-like source of Jesus’s sayings. That would explain the .062% of the texts verbatim matches in the synoptics. If the writers had copied from each other, it is likely that we would find many more identical verses in all the synoptic Gospels.

In any case, I looked for a list of an exact verbatim agreement between the synoptic Gospels. It is thin gruel. 17 verses, 306 words. There are approx 49,131 Greek words in the first 3 Gospels. So the verbatim words are <.062% of the texts. Of these 17 verses 11 are quotes by Jesus. 3 are OT quotes. 3 are narratives; those 3 verse total 34 words. That comes to .007% of the texts. Or put another way, 2.7% of Mark's Gospel is verbatim in Luke/Matthew - 306 words out of 11,304. 

Either way, that is not a very compelling case for a literary only dependence.

Here is the list:

	Exact Verbatim Matches in the Synoptics
	Matthew	Mark	Luke	Words	Note
1	3:3b	1:3	3:4b	18	OT quote
2	15:9	7:7	---	12	OT quote
3	15:32b	8:2	---	22	Jesus quote
4	---	10:15	18:17	15	Jesus quote
5	---	11:15b	19:45	11	Narrative
6	22:44	12:36b	---	19	OT quote
7	10:22a	13:13a	21:17	10	Jesus quote
8	24:16	13:14b	21:21a	9	Jesus quote
9	24:19	13:17	---	17	Jesus quote
10	26:30	14;26	---	12	Narrative
11	7:7	---	11:9a	22	Jesus quote
12	7:8	---	11:10	22	Jesus quote
13	8:9	---	7:7	38	Jesus quote
14	12:30	---	11:23	16	Jesus quote
15	12:41	---	11:32	32	Jesus quote
16	13:42b	---	13:28a	20	Jesus quote
17	27:58a	---	23:52	11	Narrative
	Matches between Gospels			Content of the matches
	Mark Luke	2		OT quote	3
	Mark Matt	5		Jesus quote	11
	Matt Luke	7		Narrative	3
	Triple	3

Source of this NET Bible - Synopsis of the Four Gospels. Page 289 - same link as above.

There seems to be some equivocation going on when critics discus this data. Critics will say the verbatim verses as evidence for copying, but then go on to cite "nearly" verbatim verses/words. While I agree that a good argument could be made for a written source is the best explanation for verbatim verses/words, the same is not the case for "nearly" verbatim.

Best explanation for the verbatim verses/words

There likely was a Q source - a hypothetical, lost written document of Jesus's sayings. that had the words of Jesus. Not only do we have the testimony of Luke where he mentions where he obtained his info for his Gospel [see LK 1:1], but there is the likelihood that the earliest Christians would have recorded words/sayings of Jesus. And it’s likely that Matthew, Luke, and maybe even Mark used Q. 

Best explanation for the "near" verbatim verses/words

All the near verbatim matches are likely due to 

1) an oral tradition of Mark’s Gospel by Greek-speaking believers. 

2) Personal memories - Matthew certainly could have recalled the events, since he was one of the twelve disciples of Jesus and thus an eyewitness to Jesus' life and ministry.

3) Witness accounts - The "we" sections in the book of Acts is evidence that Luke was a companion of Paul and traveled to places like Jerusalem and Rome, where he had the opportunity to interview people like Peter, Mary, Joanna, and others who were eyewitnesses. Plus, Luke said he has "investigated everything carefully" to write an orderly account.

When we examine the four gospels, we see that very often each of the writers have slightly different recollections of the same event. The accounts of Matthew, Mark, Luke (and John) are not perfectly matched, for good reason. Genuine independent accounts, that are written by eyewitnesses or those who talked to eyewitnesses, seldom have precisely the same details.

There are variations in the ordering of events and the details, which would be unlikely if one gospel writer had simply copied the other. These minor differences in their accounts, are evidence of four independent accounts, who used some of the same sources.

Is the oral tradition of Mark’s Gospel likely?

1) We know that there were 3 oral communities - the Romans, the Greeks, and the Jewish.

2) Mark was a disciple and companion to Apostles like Peter and Paul, thus his words would carry some weight. 

3) Greek-speaking Christian would most likely want to share Mark's Gospel, as this ties in their oral culture and their Christian faith.

Oral traditions were preserved with a high degree of care and accuracy within their cultural context. And remember, there was only 5-10 years between Mark's Gospel and Luke and Matthew's.

Conclusion

If Matthew and Luke were merely copying Mark at their desks, the pages of a parallel Bible would overflow with massive blocks of identical Greek text. Instead, we see the natural fingerprint of authentic, independent testimony: multiple witnesses recalling the same core events with varying details, unique emphases, and distinct wording. The handful of exact matches are easily explained by preserved sayings of Jesus, while the narrative freedom across all three accounts confirms their autonomy. The Gospels don't read like colluding copyists - they read like real history.