1 Samuel 20:12-15

12Then Jonathan said to David: “The Lord God of Israel is witness! When I have sounded out my father sometime tomorrow, or the third day, and indeed there is good toward David, and I do not send to you and tell you,

13may the Lord do so and much more to Jonathan. But if it pleases my father to do you evil, then I will report it to you and send you away, that you may go in safety. And the Lord be with you as He has been with my father.

14And you shall not only show me the kindness of the Lord while I still live, that I may not die;

15but you shall not cut off your kindness from my house forever, no, not when the Lord has cut off every one of the enemies of David from the face of the earth.”