Cross reference
John 18:27
27 again, therefore, Peter denied, and immediately a cock crew.
John 13:38
38 Jesus answered him, `Thy life for me thou wilt lay down! verily, verily, I say to thee, a cock will not crow till thou mayest deny me thrice.'
Matthew 26:34
34 Jesus said to him, `Verily I say to thee, that, this night, before cock-crowing, thrice thou wilt deny me.'
Matthew 26:74-75
74 Then began he to anathematise, and to swear -- `I have not known the man;' and immediately did a cock crow,
75 and Peter remembered the saying of Jesus, he having said to him -- `Before cock-crowing, thrice thou wilt deny me;' and having gone without, he did weep bitterly.
Mark 14:30
30 And Jesus said to him, `Verily I say to thee, that to-day, this night, before a cock shall crow twice, thrice thou shalt deny me.'
Mark 14:68
68 and he denied, saying, `I have not known `him', neither do I understand what thou sayest;' and he went forth without to the porch, and a cock crew.
Mark 14:71-72
71 and he began to anathematize, and to swear -- `I have not known this man of whom ye speak;'
72 and a second time a cock crew, and Peter remembered the saying that Jesus said to him -- `Before a cock crow twice, thou mayest deny me thrice;' and having thought thereon -- he was weeping.
Luke 22:60-62
60 and Peter said, `Man, I have not known what thou sayest;' and presently, while he is speaking, a cock crew.
61 And the Lord having turned did look on Peter, and Peter remembered the word of the Lord, how he said to him -- `Before a cock shall crow, thou mayest disown me thrice;'
62 and Peter having gone without, wept bitterly.
Luke 22:34
34 and he said, `I say to thee, Peter, a cock shall not crow to-day, before thrice thou mayest disown knowing me.'