Swear now therefore unto me by the LORD, that thou wilt not cut off my seed after me, and that thou wilt not destroy my name out of my father's house. Swear now - Saul knew that an oath would bind David, though it was insufficient to bind himself; see 1 Samuel 19:6. He had sworn to his son Jonathan that David should not be slain; and yet sought by all means in his power to destroy him!
Related Commentaries of 1 Samuel 24:21
1 Samuel 24:21
21 Swear now therefore unto me by the LORD, that thou wilt not cut off my seed after me, and that thou wilt not destroy my name out of my father's house.