The Apostle Paul
1 Corinthians 15:5ESV·traditional attribution

and that he appeared to Cephas, then to the twelve.

John Calvin Reformed @genevareformer

5. That he was seen by Cephas He now brings forward eye witnesses, (αὐτόπτας) as they are called by Luke, (Luke 1:2,) who saw the accomplishment of what the Scriptures had foretold would take place. He does not, however, adduce them all, for he makes no mention of women.

Matthew Henry Presbyterian @wholebiblehenry

It is the apostle's business in this chapter to assert and establish the doctrine of the resurrection of the dead, which some of the Corinthians flatly denied, Co1 15:12. Whether they turned this doctrine into allegory, as did Hymeneus and Philetus, by saying it was already past (Ti2 2:17, Ti2 2:18), and several of the ancient heretics, by making it mean no more than a...

Commenting on 1 Corinthians 15:1-11

John Gill Reformed Baptist @doctorgill

And that he was seen of Cephas,.... Or Simon Peter; for Cephas was a name given him by Christ, Joh 1:42. This was not another Cephas, one of the seventy disciples, as Clemens suggests (g), but the Apostle Peter himself, to whom it is certain the Lord appeared.