1 Samuel 24:21 in the King James Version
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.
Context
20 Now, behold, I know that you will surely be king, and that the kingdom of Israel will be established in your hand.
21 Swear now therefore to me by the LORD that you will not cut off my offspring after me, and that you will not destroy my name out of my father’s house.”
22 David swore to Saul. Saul went home, but David and his men went up to the stronghold.