Here is a post from my friend Eric Chabot. He writes about the earliest historical source for the minimal facts about the resurrection, which is the early creed recorded by Paul in 1 Corinthians: 3-7.
3 For what I received I passed on to you as of first importance: 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, and then to the Twelve.
6 After that, he appeared to more than five hundred of the brothers and sisters at the same time, most of whom are still living, though some have fallen asleep.
7 Then he appeared to James, then to all the apostles,
8 and last of all he appeared to me also, as to one abnormally…
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