1 Samuel 24:15

The Lord, therefore, because David was innocent and because Saul's persecution was foolish, be judge, and judge between me and thee, and see, and plead my cause, and deliver me out of thine hand, to be freed from the persecution of Saul by the justice of God. David here is an example to all children of God, showing what love of the enemy means. Like him, Christians should spare their enemies and reward them good for evil.