John 21:20

20 Peter turned and saw that the disciple whom Jesus loved was following them. (This was the one who had leaned back against Jesus at the supper and had said, “Lord, who is going to betray you?”)

Read John 21:20 Using Other Translations

Then Peter, turning about, seeth the disciple whom Jesus loved following; which also leaned on his breast at supper, and said, Lord, which is he that betrayeth thee?
Peter turned and saw the disciple whom Jesus loved following them, the one who had been reclining at table close to him and had said, "Lord, who is it that is going to betray you?"
Peter turned around and saw behind them the disciple Jesus loved—the one who had leaned over to Jesus during supper and asked, “Lord, who will betray you?”

What does John 21:20 mean?

John Gill's Exposition of the Bible
John 21:20

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 ) .

California - Do Not Sell My Personal Information  California - CCPA Notice