1 Samuel 24:21 KJV
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.
1 Samuel 24:21, King James Version
In context
20 And now, behold, I know well that thou shalt surely be king, and that the kingdom of Israel shall be established in thine hand.
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.
22 And David sware unto Saul. And Saul went home; but David and his men gat them up unto the hold.