So Mephibosheth lived in Jerusalem, because he always ate at the king’s table, and he was lame in both feet.
The matter is here settled concerning Mephibosheth. 1. This grant of his father's estate is confirmed to him, and Ziba called to be a witness to it (Sa2 9:9); and, it should seem, Saul had a very good estate, for his father was a mighty man of substance (Sa1 9:1), and he had fields and vineyards to bestow, Sa1 22:7.
Commenting on 2 Samuel 9:9-13
So Mephibosheth dwelt in Jerusalem,.... Either in some apartments in the king's palace, or in some house in the city provided for him; for he returned not to Lodebar, nor to any mansion house upon the estate, of Saul restored unto him: for he did eat continually at the king's table; to which he was invited, and he accepted of: and was lame on both...
Did eat continually at the king's table - He was fit for no public office, but was treated by the king with the utmost respect and affection.