'Disciple Whom Jesus Loved' in the Bible

Therefore that disciple whom Jesus loved said unto Peter, It is the Lord. Now when Simon Peter heard that it was the Lord, he girded his fisher's coat unto him, (for he was naked,) and did cast himself into the sea.

Then Peter, turning about, saw the disciple whom Jesus loved following; who also leaned on his breast at supper, and said, Lord, who is he that betrays you?