1 Samuel 20:11-17

Jonathan replied to David, “Come, let us go out into the field.” When they were out in the open country together, Jonathan said to David: “As the LORD, the God of Israel, lives, I will sound out my father about this time tomorrow. Whether he is well disposed toward David or not, I will inform you. Should it please my father to bring any harm upon you, may the LORD do thus to Jonathan and more, if I do not inform you of it and send you on your way in peace. May the LORD be with you even as he was with my father. Only this: if I am still alive, may you show me the kindness of the LORD. But if I die, never cut off your kindness from my house. And when the LORD cuts off all the enemies of David from the face of the land, the name of Jonathan must never be cut off from the family of David, or the LORD will make you answer for it.” And in his love for David, Jonathan renewed his oath to him, because he loved him as he loved himself.