Mark 14:70-72

70And he denied it again. And a little after, they that stood by said again to Peter, Surely thou art one of them: for thou art a Galilaean, and thy speech showeth it . 71But he began to curse and to swear, saying, I know not this man of whom ye speak. 72And the second time the cock crowed. And Peter called to mind the word that Jesus said to him, Before the cock shall crow twice, thou shalt deny me three times. And when he thought about it, he wept.1