There are three strands of evidence claiming that Jesus’ disciples believed they had seen the risen Jesus: Paul’s testimony about the disciples; oral traditions that passed through the early church; and the written works of the early church.
First, the Book of Acts confirms that Paul personally knew Peter, James and John. Paul knew that they claimed, just as he did, that Jesus had returned from the dead. In 1 Corinthians 15, Paul appeals to his audience’s knowledge of the fact that Christ had been seen by more than 500 people at one time. He reminds them that the majority of these people were still alive and could be questioned. Paul says in effect, “If you do not believe me, you can ask them.” He also appeared to those who were hostile or unconvinced.
Secondly, oral traditions, as mentioned in the Dating the Gospels page, were circulated very shortly after the crucifixion, lending added historical weight to the accounts of the resurrection. In Paul’s first letter to the Corinthians (1 Cor 15:3-7), he wrote of a creed he received from Peter and James while visiting them in Jerusalem 3 years after his conversion. This is within 5 years of the crucifixion. This is the sort of data that historians place a great deal of weight on. Not only is it extremely early, but it is given to Paul by eyewitnesses. It is much too early to be the result of legendary development over time. This creed has been one of the most formidable obstacles to critics who try to dispel the resurrection.
Other oral traditions of great importance are the sermons of the apostles found in the Book of Acts. The vast majority of historians believe that the early apostolic teachings are enshrined in these sermon summaries in Acts. They unambiguously declare that Jesus rose bodily from the dead.
Even the most liberal scholars have to admit that all four Gospels were written within 65 years of the crucifixion, though there is a significant amount of compelling evidence that it may have only been 17-20 years !! (see Dating the Gospels page) This is very significant especially when you consider our best two sources on Alexander the Great, for example, weren’t written until at least 400 years after his death.
Thirdly, the writings of the apostolic fathers, who were said to have known the apostles and whose writings reflect the teachings of the apostles themselves, wrote very clearly about how the apostles were dramatically impacted by Jesus’ resurrection. Clement and Polycarp were early apostolic father who wrote about and confirmed what the Gospels taught. Early church fathers Irenaeus and Tertullian, confirmed both Clement’s and Polycarp’s contacts with and instruction by the apostles. So we have a direct connection from the eyewitnesses to the events and the early church fathers.
So these 3 lines of evidence, from Paul, the oral traditions, and the writings of the apostolic and early church fathers present multiple early eyewitness testimonies to the disciples claims that they had seen the risen Jesus. In addition, it is obvious that this event profoundly affected the disciples to the core of their being. There are multiple accounts, both inside and outside of the New Testament, testifying to the fact the disciples were transformed to the point of enduring persecution and even martyrdom for the beliefs they claimed to have witnessed. I can’t think of more compelling evidence.
The disciples didn’t just believe Jesus rose from the dead, they knew for a fact that he did. There is no other explanation. It is beyond credulity to believe they would suffer and die if they know this was all a lie. Of the over 2200 scholarly citations about the resurrection mentioned earlier that Habermas reviewed, no fact was more widely recognized than that the early Christian believers had real experiences that they thought were appearances of the risen Christ. (16)
Paula Fredricksen of Boston University, who is not an evangelical, but rather a very liberal scholar claimed the disciples conviction that they saw the risen Jesus is “historical bedrock, facts known past doubting”(17) She stated: