Cross reference
Matthew 26:34
34 Jesus said to him, "Most assuredly I tell you that tonight, before the rooster crows, you will deny me three times."
John 13:38
38 Jesus answered him, "Will you lay down your life for me? Most assuredly I tell you, the rooster won't crow until you have denied me three times.
Luke 22:34
34 He said, "I tell you, Peter, the rooster will by no means crow today until you deny that you know me three times."
Matthew 26:75
75 Peter remembered the word which Jesus had said to him, "Before the rooster crows, you will deny me three times." He went out and wept bitterly.
Mark 14:30-31
30 Jesus said to him, "Most assuredly I tell you, that you today, even this night, before the rooster crows twice, you will deny me three times."
31 But he spoke all the more, "If I must die with you, I will not deny you." They all said the same thing.