Jamieson, Fausset & Brown

He saith to him . . . the second time . . . lovest thou me, &c.--In this repetition of the question, though the wound was meant to be reopened, the words "more than these" are not repeated; for Christ is a tender as well as skilful Physician, and Peter's silence on that point was confession enough of his sin and folly. On Peter's repeating his protestation in the same words, our Lord rises higher in the manifestation of His restoring grace. Feed--keep. my sheep--It has been observed that the word here is studiously changed, from one signifying simply to feed, to one signifying to tend as a shepherd, denoting the abiding exercise of that vocation, and in its highest functions.