Mark 14:70-72

70But Peter denied it again. A little later some of the other bystanders confronted Peter and said, “You must be one of them, because you are a Galilean.”

71Peter swore, “A curse on me if I’m lying—I don’t know this man you’re talking about!”

72And immediately the rooster crowed the second time. Suddenly, Jesus’ words flashed through Peter’s mind: “Before the rooster crows twice, you will deny three times that you even know me.” And he broke down and wept.