Now
I would remind you, brothers, of the gospel I preached to you, which
you received, in which you stand, and by which you are being
saved, if you hold fast to the word I preached to you—unless you believed
in vain.
For I
delivered to you as of first importance what I also received: that Christ
died for our sins in accordance with the Scriptures, that he was
buried, that he was raised on the third day in accordance with the
Scriptures, and that he appeared to Cephas, then to the
twelve. Then he appeared to more than five hundred brothers at one time,
most of whom are still alive, though some have fallen asleep. Then he
appeared to James, then to all the apostles. Last of all, as to
one untimely born, he appeared also to me.
1 Corinthians 15:1-8 (ESV)