(1) In that Christ is not only present here but also eats with his disciples, he gives a most full assurance of his resurrection.
(a) It was a linen garment which prevented him from swimming freely.
(2) Peter by this triple confession is restored into his former position from where he fell by his triple denial: and furthermore it is proclaimed that he is indeed a pastor, who shows his love to Christ in feeding his sheep.
(b) It was appropriate that he that had denied him three times should confess him three times, so that Peter might neither doubt the forgiveness of his grievous sin, nor his being restored to the office of the apostleship.
(3) The violent death of Peter is foretold.
(c) Those that took long trips, especially in the east and in those places where the people used long garments, needed to be girded and fastened up.
(d) He meant that kind of girding which is used with captives, when they are bound fast with cords and chains, as one would say, "Now you gird yourself as you think best, to go where you want to go, but the time will come when you will not gird yourself with a girdle, but another will bind you with chains, and carry you where you would not."
(e) Not that Peter suffered anything for the truth of God against his will, for we read that he came with joy and gladness when he returned from the council where he was whipped, but because this will comes not from the flesh, but from the gift of the Spirit who is given to us from above, therefore he shows that there should be a certain striving and conflict or repugnancy, which also is in us, in all our sufferings as touching the flesh.
(f) That is, that Peter would die by a violent death.
(4) We must take heed that while we cast our eyes upon others that we do not neglect that which we are commanded to do.
(5) The history of Christ is truly and cautiously written: not for the curiosity of men, but for the salvation of the godly.
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Beza, Theodore. "Commentary on John 21". "The 1599 Geneva Study Bible". https://pro.studylight.org/
the Week of Christ the King / Proper 29 / Ordinary 34