Art not thou also one, &c.— It seems the damsel, after having admitted Peter, followed him to the fire, and spake to him there in an angry tone, having been informed that it was he who had cut off her fellow-servant's ear. See John 18:26 and the parallel places.
Related Commentaries of John 18:17
John 18:17
17 Then saith the damsel that kept the door unto Peter, Art not thou also one of this man's disciples? He saith, I am not.