1 Samuel 25:29-31

29Even though someone is pursuing you to take your life, the life of my lord will be bound securely in the bundle of the living by the Lord your God, but the lives of your enemies he will hurl away as from the pocket of a sling.

30When the Lord has fulfilled for my lord every good thing he promised concerning him and has appointed him ruler over Israel,

31my lord will not have on his conscience the staggering burden of needless bloodshed or of having avenged himself. And when the Lord your God has brought my lord success, remember your servant.”