And Simon Peter followed Jesus, and so did another disciple: that disciple was known unto the high priest, and went in with Jesus into the court of the high priest.
All Commentaries on John 18:15 Go To John 18
Cyril of Alexandria
Now that disciple was known unto the high priest, and entered in with Jesus into the court of the high priest.
The Apostle shows great forethought in condescending to mention this fact, and does not scruple to enter into detail where it is profitable for us. For, as he was about to set down in order in his book what was done and said in the palace of the high priest, he was, as it were, compelled to show us how he was able to enter there with Christ; for, he says, he was known unto the high priest. He enters, therefore, without hindrance, his knowledge of the leader of the people----for he has not thought proper to say friendship----allowing him free entrance within the doors. In order, then, that he might convince us that he did not compile his account of what took place in the palace from information drawn from others, but that he himself saw and heard what passed, he has given us this most useful explanation of his knowledge of the high priest.