1 Samuel 24:22

Now then swear to me by the Lord, that thou wilt not destroy my seed after me, that thou wilt not blot out my name from the house of my father.

And David sware unto Saul. And Saul went home; but David and his men gat them up unto the hold.

David swore to Saul. Saul went home, but David and his men went up to the stronghold.