16 but Peter stood at the door without. Then the other disciple who was known to the chief priest went out and spoke to the door-keeper, and brought in Peter.
John 18:16 Cross References - Sawyer
Matthew 26:69
69 (24:7) But Peter sat without in the court; and a female servant came to him, saying, You also were with Jesus the Galilean.
Mark 14:66-68
66 (15:3) And Peter being in the court below, one of the female servants of the chief priest came,
67 and seeing Peter warming himself, looked at him, and said, You also were with Jesus the Nazarene.
68 But he denied it, saying, I do not know [him]; neither do I know what you say. And he went out into the porch, and a cock crew.