But the king spared Mephibosheth, the son of Jonathan the son of Saul, because of Jehovah's oath that was between them, between David and Jonathan the son of Saul.

And David said, Is there still any that is left from the house of Saul, that I may show him kindness for Jonathan's sake? And there was of the house of Saul a servant whose name was Ziba. And they called him to David, and the king said to him, Are you Ziba? And he said, Your servant. And the king said, Is there not still any of the house of Saul, so that I may show the kindness of God to him? And Ziba said to the king, Jonathan still has a son, who is lame in his feet. read more.
And the king said to him, Where is he? And Ziba said to the king, Behold, he is in the house of Machir, the son of Ammiel, in Lodebar. And King David sent and brought him out of the house of Machir the son of Ammiel, from Lodebar. And Mephibosheth, the son of Jonathan, the son of Saul, came to David, and fell on his face and bowed to him. And David said, Mephibosheth! And he answered, Behold your servant! And David said to him, Do not fear, for I will surely show you kindness for Jonathan your father's sake, and will restore you all the land of Saul your father. And you shall eat bread at my table forever.