1 Samuel 24:17-19

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