Luke 22:60

But Peter said: "I do not know what you are speaking about." Instantly, while he was still speaking, a cock crowed.

Matthew 26:74-75

Then Peter began to swear, with most solemn imprecations: "I do not know the man." At that moment a cock crowed;

Mark 14:71-72

But he began to swear with the most solemn imprecations: "I do not know the man you are speaking about."

Luke 22:34

"I tell you, Peter," replied Jesus, "the cock will not crow to-day till you have disowned all knowledge of me three times."

John 18:27

Peter again denied it; and at that moment a cock crowed.

Treasury of Scripture Knowledge

Summary

And Peter said, Man, I know not what thou sayest. And immediately, while he yet spake, the cock crew.

Bible References

The cock

Luke 22:34
"I tell you, Peter," replied Jesus, "the cock will not crow to-day till you have disowned all knowledge of me three times."
Matthew 26:74
Then Peter began to swear, with most solemn imprecations: "I do not know the man." At that moment a cock crowed;
Mark 14:71
But he began to swear with the most solemn imprecations: "I do not know the man you are speaking about."
John 18:27
Peter again denied it; and at that moment a cock crowed.