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.

Mark 14:38

14:38 Stay awake and pray that you will not fall into temptation. The spirit is willing, but the flesh is weak.”