1 Samuel 20:21-22

21Then I will send a boy to find the arrows. If you are not in danger I will say to the boy, “The arrows are on this side of you. Come and bring them here.” That will mean that you are safe. You can then come out from the place where you are hiding. As surely as the Lord lives, I promise that you will not be in trouble.

22But if I say to the boy, “Look, the arrows are beyond you,” you must run away. It will mean that the Lord has sent you away.