1st Samuel 20:19

16 So Jonathan made a covenant with the house of David, saying, Let the LORD even require it at the hand of David's enemies.

17 And Jonathan caused David to swear again, because he loved him: for he loved him as he loved his own soul.

18 Then Jonathan said to David, To morrow is the new moon: and thou shalt be missed, because thy seat will be empty.

19 And when thou hast stayed three days, then thou shalt go down quickly, and come to the place where thou didst hide thyself when the business was in hand, and shalt remain by the stone Ezel.

20 And I will shoot three arrows on the side thereof, as though I shot at a mark.

21 And, behold, I will send a lad, saying, Go, find out the arrows. If I expressly say unto the lad, Behold, the arrows are on this side of thee, take them; then come thou: for there is peace to thee, and no hurt; as the LORD liveth.

22 But if I say thus unto the young man, Behold, the arrows are beyond thee; go thy way: for the LORD hath sent thee away.