The Cock Crew
A courtyard by night, a fire, three denials, a cock on the wall at first light, and Peter going out. Scroll to watch it.
And when he was gone out into the porch, another maid saw him, and saith, this man also was there with Jesus of Nazareth. And again he denied with an oath. And after a while came unto him they that stood by, and said unto Peter, surely thou also art one of them, for thy speech bewrayeth thee. Then began he to curse and to swear, I know not the man. And immediately the cock crew. And Peter remembered the words of Jesus, which said, before the cock crow, thou shalt deny me thrice. And he went out, and wept bitterly.
Matthew 26:71-75, as St John Chrysostom gives it
And this Luke saith, namely, that Christ looked on him showing that he not only denied Him, but was not even brought to remembrance from within, and this though the cock had crowed; but he needed a further remembrance from his master, and His look was to him instead of a voice; so exceedingly was he full of fear.
John Chrysostom, Homilies on Matthew LXXXV.1