Thematic Bible: Living in exile from the king, remembered because of a covenant

And the king said, Is there no one left of the house of Saul that I may show the mercy of God unto him? And Ziba said unto the king, There remains a son of Jonathan, who is lame on his feet. And the king said unto him, Where is he? And Ziba said unto the king, Behold, he is in the house of Machir, the son of Ammiel, in Lodebar.

And if I live, thou shalt show me the mercy of the LORD, but if I am dead, thou shalt not cut off thy mercy from my house for ever. When the LORD has cut off one by one the enemies of David from the face of the earth, remove even Jonathan from thy house if I fail thee and require it at the hand of David's enemies.