John 18:15-16

John 18:15-16. That disciple was known unto the high priest, and went in with Jesus into the palace of the high priest. But Peter stood at the door without. Then went out that other disciple, which was known unto the high priest, and spake unto her that kept the door, and brought in Peter.

I always fancy that John had a greater tenderness for Peter because he was the means of getting him into the palace of the high priest. Peter could not have got in if he had been alone, but John was known to the high priest, and so secured his admission. He must always have felt sorry that he took Peter into a place where he was so strongly tried. Hence John sought him out after his great fall; when perhaps the other apostles were inclined to leave him by himself, John cheered him up, and brought him back to the faith.