John the Apostle
John 21:19ESV·traditional attribution

(This he said to show by what kind of death he was to glorify God.) And after saying this he said to him, “Follow me.”

John Calvin Reformed @genevareformer

19. Signifying by what death he should glorify God. This circumlocution is highly emphatic; for though the end held out to all believers ought to be, to glorify God both by their life and by their death, yet John intended to employ a remarkable commendation for adorning the death of those who, by their blood, seal the Gospel of Christ and glorify his name, as...

Matthew Henry Presbyterian @wholebiblehenry

We have here Christ's discourse with Peter after dinner, so much of it as relates to himself, in which, I. He examines his love to him, and gives him a charge concerning his flock, Joh 21:15-17. Observe, 1. When Christ entered into this discourse with Peter.

Commenting on John 21:15-19

John Gill Reformed Baptist @doctorgill

This spake he,.... These are the words of the evangelist, explaining the meaning of Christ in like manner, as in Joh 12:33 signifying by what death he should glorify God; for by the above words Christ not only intimated that Peter should die, not a natural, but a violent death, or that he should die a martyr in his cause, but the very kind of...