1 Samuel 20:18-22

18Then Jonathan said to David, “Tomorrow is the New Moon [festival], and you will be missed because your seat will be empty.

19When you have stayed for three days, you shall go down quickly and come to the place where you hid yourself on that eventful day [when my father tried to kill you], and shall stay by the stone Ezel.

20I will shoot three arrows to the side of it, as though I shot at a target.

21And I will send a boy, saying, ‘Go, find the arrows.’ If I specifically say to the boy, ‘Look, the arrows are on this side of you, get them,’ then come [back to my father’s table]; for it is safe for you and there is no danger, as the Lord lives.

22But if I say to the boy, ‘Look, the arrows are beyond you,’ then go, for the Lord has sent you away.