John 21:7; John 21:20; John 21:24
That disciple therefore whom Jesus loved said to Peter, "It's the Lord!" So when Simon Peter heard that it was the Lord, he wrapped his coat around him (for he was naked), and threw himself into the sea.
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?"
This is the disciple who testifies about these things, and wrote these things. We know that his witness is true.