John 21:20 thru 23

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?”

21 So Peter seeing him said to Jesus, “Lord, and what about this man?”

22 Jesus said to him, “If I want him to remain until I come, what is that to you? You follow Me!”

23 Therefore this saying went out among the brethren that that disciple would not die; yet Jesus did not say to him that he would not die, but only, “If I want him to remain until I come, what is that to you?”