1 Samuel 20:13-17

If it pleases my father to do you harm, may the Lord do so to me and more so, if I fail to inform you and send you away, so that you may go in safety. And may the Lord be with you as He has been with my father.

And if I am still alive, will you not show me the faithfulness of the Lord, so that I do not die?

And you shall never cut off your loyalty to my house, not even when the Lord cuts off every one of the enemies of David from the face of the earth.”

So Jonathan made a covenant with the house of David, saying, “May the Lord demand it from the hands of David’s enemies.”

And Jonathan made David vow again because of his love for him, because he loved him as he loved his own life.