NET

21 Saul replied, “I have sinned. Come back, my son David. I won’t harm you anymore, for you treated my life with value this day. I have behaved foolishly and have made a very terrible mistake!”

Darby

21 And Saul said, 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 acted foolishly, and have erred exceedingly.

KJV

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.