The earliest testimony
Begin with the oldest Christian writing that tells of the resurrection. Paul wrote this letter around AD 54. Here he passes on a creed he had himself received, which most historians date to within a few years of the crucifixion. It names the witnesses who could still be questioned: Peter, the Twelve, James, and more than five hundred others.
3 For I delivered to you first of all that which I also received: that Christ died for our sins according to the Scriptures, 4 that he was buried, that he was raised on the third day according to the Scriptures, 5 and that he appeared to Cephas, then to the twelve. 6 Then he appeared to over five hundred brothers at once, most of whom remain until now, but some have also fallen asleep. 7 Then he appeared to James, then to all the apostles, 8 and last of all, as to the child born at the wrong time, he appeared to me also.