Now, you who know your Bible know that Saul typified this
world; he ruled the kingdom that God intended David to rule.

For a long time David didn’t really become the king, but now he is king in fact, and he sends out this message asking if there is any of the house of Saul left.

Why is he asking that question? Long before he became king in fact, in
that familiar story when he was hunted in the woods by Saul, Jonathan
went to him and they two made a covenant in the woods together. In this
covenant, David promised to show kindness to the descendants of
Jonathan. So the action of David is based upon a covenant made with
another long ago. Now Mephibosheth will become the beneficiary of that
covenant previously made; and for the sake of another, the king “sent,
and fetched him.”

Now when Mephibosheth came unto David in the king’s court, he
fell on his face and did reverence. “And David said, Mephibosheth….”
David called him by name. Remember that! Mephibosheth answered,
“Behold thy servant!” The first thing David did was call him by name.
Then David said, “Fear not: for I will surely shew thee kindness for
Jonathan thy father’s sake, and will restore thee all the land of Saul thy
father.”

Look what happens to this son of Jonathan: “thou shalt eat bread
at my table continually.” Mephibosheth was overwhelmed. “He bowed
himself, and said, What is thy servant, that thou shouldest look upon such a dead dog as I am?” The king just poured out blessings. In verse 10,
David said to Ziba, “Mephibosheth thy master’s son shall eat bread alway
at my table.”

In verse 11, “As for Mephibosheth, said the king, he shall
eat at my table, as one of the king’s sons.” In verse 13, “So
Mephibosheth dwelt in Jerusalem: for he did eat continually at the king’s
table; and was lame on both his feet.”