John 21:20-22

Peter, turning around, *saw the disciple whom Jesus loved following them; the one who also had leaned back on His bosom at the supper and said, “Lord, who is the one who betrays You?” So Peter seeing him *said to Jesus, “Lord, and what about this man?” Jesus *said to him, “If I want him to remain until I come, what is that to you? You follow Me!”