Matthew 5:23

5:23 So then, if you bring your gift to the altar and there remember that your brother has something against you,

Matthew 26:75

26:75 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 

[26:75]  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.