I Samuel 26:21

21 Then Saul said, "I have sinned. Come back, David my son. Because you considered my life precious today, I will not try to harm you again. Surely I have acted like a fool and have been terribly wrong."

21 Then said Saul, I have sinned: return, my son David; for I will no more do thee harm, because my life was precious in thine eyes this day: behold, I have played the fool, and have erred exceedingly.