Peter denied it. "I don't know what you're talking about," he said, and he went out into the entryway. Just then, a rooster crowed.
References for Mark 14:68
The servant girl saw him standing there and began telling the others, "That man is definitely one of them!"
Peter denied it again.A little later some other bystanders began saying to Peter, "You must be one of them because you are from Galilee."
Peter said, "I swear by God, I don't know this man you're talking about."
And immediately the rooster crowed the second time. Suddenly, Jesus' words flashed through Peter's mind: "Before the rooster crows twice, you will deny me three times." And he broke down and cried.