This is the disciple who is bearing witness about these things, and who has written these things, and we know that his testimony is true.
24. This is that disciple. Having hitherto mentioned himself in the third person, John now declares that it is himself; that greater weight may be attached to the statements of one who was an eye-witness, and who had fully known all that he relates.
In these verses, we have, I. The conference Christ had with Peter concerning John, the beloved disciple, in which we have, 1. The eye Peter cast upon him (Joh 21:20): Peter, in obedience to his Master's orders, followed him, and turning about, pleased with the honours his Master now did him, he sees the disciple whom Jesus loved following likewise. Observe here, (1.) How John is described.
Commenting on John 21:20-25
This is the disciple which testifieth of these things,.... Recorded in this chapter concerning the appearance of Christ to his disciples at the sea of Tiberias, and what were done by him in their presence, what passed between them; particularly the conversation he had with Peter, both concerning himself, and the disciple John: and also, of all things that are written in this whole Gospel.