John Gill Commentary 2 Samuel 9:3

"And the king said, Is there not yet any of the house of Saul, that I may show the kindness of God unto him? And Ziba said unto the king, Jonathan hath yet a son, who is lame of his feet." — 2 Samuel 9:3 (ASV)

And the king said, [is] there not yet any of the house of Saul ;
that is, remaining or living:

that I may show the kindness of God unto him ?
great kindness, some large favour or benefit; for the word God added to things, as to trees, mountains serves to set forth the excellency of them; and this kindness is in imitation of God, or such as he had sworn in the presence of God to show; and that is expressed in the same language, (1 Samuel 20:14) ;

and Ziba said unto the king, Jonathan has yet a son ;
a son still living;

[which is] lame on [his] feet ;
on both his feet, as the Targum; of which occasion, (See Gill on 2 Samuel 4:4).