John 21:20-24 ESV
Peter turned and saw the disciple whom Jesus loved following them, the one who also had leaned back against him during the supper and had said, “Lord, who is it that is going to betray you?” When Peter saw him, he said to Jesus, “Lord, what about this man?” Jesus said to him, “If it is my will that he remain until I come, what is that to you? You follow me!” So the saying spread abroad among the brothers that this disciple was not to die; yet Jesus did not say to him that he was not to die, but, “If it is my will that he remain until I come, what is that to you?”
This is the disciple who is bearing witness about these things, and who has written these things, and we know that his testimony is true.
ESV: English Standard Version 2016