Mark 14:66-72

66While Peter was below in the courtyard, one of the servant girls of the high priest came by. 67When she saw Peter warming himself, she looked closely at him. "You also were with that Nazarene, Jesus," she said.
68But he denied it. "I don't know or understand what you're talking about," he said, and went out into the entryway.
69When the servant girl saw him there, she said again to those standing around, "This fellow is one of them." 70Again he denied it. After a little while, those standing near said to Peter, "Surely you are one of them, for you are a Galilean."
71He began to call down curses on himself, and he swore to them, "I don't know this man you're talking about."
72Immediately the rooster crowed the second time. Then Peter remembered the word Jesus had spoken to him: "Before the rooster crows twice you will disown me three times." And he broke down and wept.