John 21:20-23 - Peter And The Other Disciple Jesus Loved
20 Peter turned and saw following them the disciple who was very dear to Jesus, who at the supper leaned back on Jesus' breast and said, "Master, who is it that is going to betray you?" 21 When Peter saw him, he said to Jesus, "But, Master, what about him?"
22 Jesus said to him, "If I wish him to wait till I come, what does it matter to you? You must follow me."
23 So the story spread among the brothers that this disciple was not going to die. But Jesus did not tell him that he was not going to die; he said, "If I wish him to wait till I come, what does it matter to you?"