John 21:20-22

20Then Peter, turning around, saw the disciple whom Jesus loved following, who also had leaned on His breast 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.”