GOD'S WORD® Translation
Peter turned around and saw the disciple whom Jesus loved. That disciple was following them. He was the one who leaned against Jesus' chest at the supper and asked, "Lord, who is going to betray you?"

American Standard Version
Peter, turning about, seeth the disciple whom Jesus loved following; who also leaned back on his breast at the supper, and said, Lord, who is he that betrayeth thee?

Berean Study Bible
Peter turned and saw the disciple whom Jesus loved following them. He was the one who had leaned back against Jesus at the supper to ask, “Lord, who is going to betray You?”

Douay-Rheims Bible
Peter turning about, saw that disciple whom Jesus loved following, who also leaned on his breast at supper, and said: Lord, who is he that shall betray thee?

English Revised Version
Peter, turning about, seeth the disciple whom Jesus loved following; which also leaned back on his breast at the supper, and said, Lord, who is he that betrayeth thee?

King James Bible
Then Peter, turning about, seeth the disciple whom Jesus loved following; which also leaned on his breast at supper, and said, Lord, which is he that betrayeth thee?

World English Bible
Then Peter, turning around, saw a disciple following. This was the disciple whom Jesus sincerely loved, the one who had also leaned on Jesus' breast at the supper and asked, "Lord, who is going to betray You?"

Young's Literal Translation
And Peter having turned about doth see the disciple whom Jesus was loving following, (who also reclined in the supper on his breast, and said, 'Sir, who is he who is delivering thee up?')

John 21:20 Additional Translations ...