1st Samuel 20:14

11 And Jonathan said unto David, Come, and let us go out into the field. And they went out both of them into the field.

12 And Jonathan said unto David, O LORD God of Israel, when I have sounded my father about to morrow any time, or the third day, and, behold, if there be good toward David, and I then send not unto thee, and shew it thee;

13 The LORD do so and much more to Jonathan: but if it please my father to do thee evil, then I will shew it thee, and send thee away, that thou mayest go in peace: and the LORD be with thee, as he hath been with my father.

14 And thou shalt not only while yet I live shew me the kindness of the LORD, that I die not:

15 But also thou shalt not cut off thy kindness from my house for ever: no, not when the LORD hath cut off the enemies of David every one from the face of the earth.

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.