Meanwhile Simon Peter was following Jesus, as was another disciple. That disciple was an acquaintance of the high priest; so he went with Jesus into the high priest's courtyard.
References for John 18:15
But Peter remained standing outside by the door. So the other disciple, the one known to the high priest, went out and spoke to the girl who was the doorkeeper and brought Peter in.
Then the slave girl who was the doorkeeper said to Peter, "You aren't one of this man's disciples too, are you?" "I am not!" he said.
Now the slaves and the temple police had made a charcoal fire, because it was cold. They were standing there warming themselves, and Peter was standing with them, warming himself.