John 21:15

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. - It was after they had dined: they had all eaten, and were filled, and, it is probable, were entertained with such edifying discourse as our Lord Jesus used to make his table-talk. Christ foresaw that what he had to say to Peter would give him some uneasiness, and therefore would not say it till they had dined, because he would not spoil his dinner. Peter was conscious to himself that he had incurred his Master's displeasure, and could expect no other than to be upbraided with his treachery and ingratitude. "Was this thy kindness to thy friend? Did not I tell thee what a coward thou wouldest prove?" Nay, he might justly expect to be struck out of the roll of the disciples, and to be expelled the sacred college. Twice, if not thrice, he had seen his Master since his resurrection, and he said not a word to him of it. We may suppose Peter full of doubts upon what terms he stood with his Master; sometimes hoping the best, because he had received favour from him in common with the rest; yet not without some fears, lest the chiding would come at last that would pay for all.

— Matthew Henry's Concise Commentary (public domain)

when they had dined, Jesus saith--Silence appears to have reigned during the meal; unbroken on His part, that by their mute observation of Him they might have their assurance of His identity the more confirmed; and on theirs, from reverential shrinking to speak till He did. Simon, son of Jonas, lovest thou me more than these?--referring lovingly to those sad words of Peter, shortly before denying his Lord, "Though all men shall be offended because of Thee, yet will I never be offended" (Mat 26:33), and intending by this allusion to bring the whole scene vividly before his mind and put him to shame. Yea, Lord; thou knowest that I love thee--He adds not, "more than these," but prefixes a touching appeal to the Saviour's own omniscience for the truth of his protestation, which makes it a totally different kind of speech from his former. He saith unto him, Feed my lambs--It is surely wrong to view this term as a mere diminutive of affection, and as meaning the same thing as "the sheep" [WEBSTER and WILKINSON]. It is much more according to usage to understand by the "lambs," young and tender disciples, whether in age or Christian standing (Isa 40:11; Jo1 2:12-13), and by the "sheep" the more mature. Shall we say (with many) that Peter was here reinstated in office? Not exactly, since he was not actually excluded from it.

— Jamieson-Fausset-Brown Commentary (public domain)