20Then Peter, turning around, saw the disciple whom Jesus loved following, who also had reclined on His chest at the supper, and said, “Lord, who is the one who betrays You?”
21Peter, seeing him, said to Jesus, “But Lord, what about this man?”
22Jesus said to him, “If I will that he remain till I come, what is that to you? You follow Me.”
23Therefore this saying went out among the brothers that this disciple would not die. Yet Jesus did not say to him that he would not die, but, “If I will that he remain till I come, what is that to you?”
24This is the disciple who testifies of these things, and wrote these things; and we know that his testimony is true.
John 21
John 21:20-24