1 Samuel 24:17-19

And he said to David, Thou art more righteous than I: for thou hast rewarded me good, whereas I have rewarded thee evil. And thou hast shewed this day how that thou hast dealt well with me: forasmuch as when the LORD had delivered me into thine hand, thou killedst me not. For if a man find his enemy, will he let him go well away? wherefore the LORD reward thee good for that thou hast done unto me this day.