Matthew 26:74-75

74Peter said to them very strongly, ‘I tell you that I do not know that man. God will surely punish me if this is not true!’ Immediately after Peter said this, the cockerel sang.

75Then Peter remembered that Jesus had said to him, ‘Tonight you will say three times that you do not know me. You will do it before the cockerel sings.’ So Peter went out of the yard. He began to weep a lot because he was very upset.