Mark 14:68
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.
Matthew 26:71-72
And he having gone forth to the porch, another female saw him, and saith to those there, 'And this one was with Jesus of Nazareth;'
Mark 14:29-31
And Peter said to him, 'And if all shall be stumbled, yet not I;'
Mark 14:72
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.
John 13:36-38
Simon Peter saith to him, 'Sir, whither dost thou go away?' Jesus answered him, 'Whither I go away, thou art not able now to follow me, but afterward thou shalt follow me.'
2 Timothy 2:12-13
if we do endure together -- we shall also reign together; if we deny him, he also shall deny us;