The Denial of Peter.
The first denial:
Related Commentaries of Mark 14:66
Mark 14:66-68
66 And as Peter was beneath in the palace, there cometh one of the maids of the high priest:
67 And when she saw Peter warming himself, she looked upon him, and said, And thou also wast with Jesus of Nazareth.
68 But he denied, saying, I know not, neither understand I what thou sayest. And he went out into the porch; and the cock crew.