1 Corinthians 15:4

By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.

For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;

And that he was seen of Cephas, then of the twelve:

After that, he was seen of above five hundred brethren at once; of whom the greater part remain unto this present, but some are fallen asleep.