The Apostle Paul
1 Corinthians 15:6ESV·traditional attribution

Then he appeared to more than five hundred brothers at one time, most of whom are still alive, though some have fallen asleep.

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

After that he was seen of above five hundred brethren at once,.... Not at, or near Jerusalem, for the number of the disciples that were together there, made but about an hundred and twenty, Act 1:15 but in Galilee, where Christ, in the days of his flesh, had most chiefly conversed, most frequently preached and wrought his miracles, and where the number of his disciples...

Albert Barnes Presbyterian @notesbybarnes

Verse 6. Above five hundred brethren at once. More than five hundred Christians or followers of Jesus at one time. This was probably in Galilee, where the Lord Jesus had spent the greater part of his public ministry, and where he had made most disciples. The place, however, is not designated, and of course cannot be known.