(20) Peter, turning about, seeth the disciple whom Jesus loved following.--We must suppose that St. Peter had retired with our Lord, and that St. John seeing this had followed at a distance. He had been the companion and friend of St. Peter (comp. Introduction, p. 371). More than any other--and this is made prominent here--he had entered into close communion with the Lord Himself. He was called the "disciple whom Jesus loved" (comp. John 20:2, and Introduction, p. 375); he had leaned on His breast at supper, and, at a sign from Peter, had asked who was the traitor; he may well think that for him too there was some glimpse into the future, some declaration of what his path should be; or in that mingling of act and thought, of sign and thing signified, which run all through these verses, his following may indicate that he too, though he had never dared to say so, was ready to follow wherever the Master went.

Verses 20-23. -

(3) The revelations made to patient waiting for the coming of the Lord, with correction of a misunderstanding touching the disciple whom Jesus loved. Verse 20. - Having turned himself round, instead of keeping every glance for his Lord, Peter seeth the disciple whom Jesus loved following (ἀκολουθοῦντα), obeying the command without offering one suggestion. The writer adds, by way of further identification, he who also leaned back at the supper, upon his breast, and said, Who is he that betrayeth thee? (see notes on John 13:23). The note is here introduced to show the close connection of Peter and the beloved disciple. It was Simon Peter who had beckoned at the supper to the beloved disciple to ask this very question.

21:20-24 Sufferings, pains, and death, will appear formidable even to the experienced Christian; but in the hope to glorify God, to leave a sinful world, and to be present with his Lord, he becomes ready to obey the Redeemer's call, and to follow Him through death to glory. It is the will of Christ that his disciples should mind their own duty, and not be curious about future events, either as to themselves or others. Many things we are apt to be anxious about, which are nothing to us. Other people's affairs are nothing to us, to intermeddle in; we must quietly work, and mind our own business. Many curious questions are put about the counsels of God, and the state of the unseen world, as to which we may say, What is this to us? And if we attend to the duty of following Christ, we shall find neither heart nor time to meddle with that which does not belong to us. How little are any unwritten traditions to be relied upon! Let the Scripture be its own interpreter, and explain itself; as it is, in a great measure, its own evidence, and proves itself, for it is light. See the easy setting right such mistakes by the word of Christ. Scripture language is the safest channel for Scripture truth; the words which the Holy Ghost teaches, 1Co 2:13. Those who cannot agree in the same terms of art, and the application of them, may yet agree in the same Scripture terms, and to love one another.Then Peter turning about,.... After he was risen, and was following Christ:

seeth the disciple whom Jesus loved following also; by whom is designed John the Evangelist, and writer of this Gospel; who hearing Christ bid Peter follow him, rose up likewise, and went after him, in token of his willingness to serve him, and suffer for him too:

which also leaned on his breast at supper; at the "paschal supper", as the Persic version here reads it: "and said, Lord, which is he that betrayeth thee?" This disciple had a peculiar share in the love of Christ, as man, and was admitted to great nearness and freedom with him, signified by his leaning on his breast; and who being so near his person, and allowed to use a liberty with him, everyone did not take, at the motion of Peter, asked our Lord at supper, who the person was he meant that should betray him; all this is said as descriptive of the disciple here spoken of, which leaves it without any doubt, that it was the Apostle John; and who, from John 21:2 appears to be one of this company, and is further confirmed at John 21:24.