1st Samuel 20:13

10 Then said David to Jonathan, Who shall tell me if perchance your father answer you roughly?

11 Jonathan said to David, Come, and let us go out into the field. They went out both of them into the field.

12 Jonathan said to David, Yahweh, the God of Israel, [be witness]: when I have sounded my father about this time tomorrow, [or] the third day, behold, if there be good toward David, shall I not then send to you, and disclose it to you?

13 Yahweh do so to Jonathan, and more also, should it please my father to do you evil, if I don`t disclose it to you, and send you away, that you may go in peace: and Yahweh be with you, as he has been with my father.

14 You shall not only while yet I live show me the lovingkindness of Yahweh, that I not die;

15 but also you shall not cut off your kindness from my house forever; no, not when Yahweh has cut off the enemies of David everyone from the surface of the earth.

16 So Jonathan made a covenant with the house of David, [saying], Yahweh will require it at the hand of David`s enemies.