Mark 14:68-70
14:68 But he denied it: “I don’t even understand what you’re talking about!” Then he went out to the gateway, and a rooster crowed.
14:69 When the slave girl saw him, she began again to say to the bystanders, “This man is one of them.”
14:70 But he denied it again. A short time later the bystanders again said to Peter, “You must be one of them, because you are also a Galilean.”