Matthew 26:35
Context26:35 Peter said to him, “Even if I must die with you, I will never deny you.” And all the disciples said the same thing.
Matthew 26:75
Context26:75 Then Peter remembered what Jesus had said: “Before the rooster crows, you will deny me three times.” And he went outside and wept bitterly. 1
1 sn When Peter went out and wept bitterly it shows he really did not want to fail here and was deeply grieved that he had.