John 18:17

The servant girl recognized the "other disciple" as one of Jesus’ disciples. She asked Peter if he was one too, expecting a negative reply, as the Greek text makes clear. Her question reflected some disdain for Jesus. Peter succumbed to the pressure of the moment and denied his association with Jesus (13:37). Peter denied that he was one of Jesus’ disciples, not that Jesus was the Messiah. Perhaps what he had done to Malchus made him more eager to blend into his surroundings.