1 Samuel 26:21

26:21 Then said Saul, I have sinned: return, my son David; for I will no more do you harm, because my life was precious in your eyes this day: behold, I have played the fool, and have erred exceedingly.
-World English Bible

Other Translation

26:21 Then said Saul, I have sinned: return, my son David: for I will no more do thee harm, because my soul was precious in thine eyes this day: behold, I have played the fool, and have erred exceedingly.
-King James Version