20Then Peter, turning around, saw a disciple following. This was the disciple who Jesus sincerely loved, the one who had also leaned on Jesus’ breast at the supper and asked, “Lord, who is going to betray You?”
21Peter therefore, seeing him, asked Jesus, “Lord, what about this man?”
22Jesus answered, “If I want him to remain until I come, what is that to you? You follow me!”
23Because of this answer, the rumor spread among the brothers that this disciple wouldn’t die, but Jesus didn’t tell him that he wouldn’t die, but only, “If I want him to remain until I come, what is that to you?”
24This is the disciple who testifies about these things, and who wrote these things. We know that his testimony is true.
John 21
John 21:20-24