Mark 14:68-72

But he denied it, saying, “I neither know nor understand what you are talking about.” And he went out onto the porch.

The slave woman saw him, and began once more to say to the bystanders, “This man is one of them!”

But again he denied it. And after a little while the bystanders were again saying to Peter, “You really are one of them, for you are a Galilean as well.”

But he began to curse himself and to swear, “I do not know this Man of whom you speak!”

And immediately a rooster crowed a second time. And Peter remembered how Jesus had made the remark to him, “Before a rooster crows twice, you will deny Me three times.” And he hurried on and began to weep.