Mark 14:29-31
14:29 Peter said to him, “Even if they all fall away, I will not!”
14:30 Jesus said to him, “I tell you the truth, today – this very night – before a rooster crows twice, you will deny me three times.”
14:31 But Peter insisted emphatically, “Even if I must die with you, I will never deny you.” And all of them said the same thing.