I Samuel 24:17-19

Then he said to David: “You are more righteous than I; for you have rewarded me with good, whereas I have rewarded you with evil. And you have shown this day how you have dealt well with me; for when the LORD delivered me into your hand, you did not kill me. For if a man finds his enemy, will he let him get away safely? Therefore may the LORD reward you with good for what you have done to me this day.