1 Samuel 20:13-17

13The LORD do so to Jonathan, and more also, should it please my father to do thee evil, if I disclose it not unto thee, and send thee away, that thou mayest go in peace: and the LORD be with thee, as he hath been with my father.

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

15but 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.

16So Jonathan made a covenant with the house of David, saying, And the LORD shall require it at the hand of David’s enemies.

17And Jonathan caused David to swear again, for the love that he had to him: for he loved him as he loved his own soul.