John Gill Commentary 2 Samuel 9:7

"And David said unto him, Fear not; for I will surely show thee kindness for Jonathan thy father`s sake, and will restore thee all the land of Saul thy father; and thou shalt eat bread at my table continually." — 2 Samuel 9:7 (ASV)

And David said to him, fear not
He might observe a dejection in his countenance, a trembling in his limbs, and might discover signs of fear lest David should cut him off, because he was of the seed royal:

for I will surely show you kindness for Jonathan your father's sake ;
whom he loved as his own soul, and to whom he had sworn that he would not cut off his kindness from his house for ever, and now remembering his oath was determined to observe it:

and will restore you all the land of Saul your father ;
his grandfather, such sometimes being called fathers; which David had taken to him, as crown lands, or in the right of his wife; or as being confiscated by Ishbosheth's rebellion:

and you shall eat bread at my table continually ;
he gave him an apartment in the court, a place at his table, admitted him to be a guest with him as long as he should live; which was a very great favour and high honour, and showed what an unshaken friendship he had for his father, and would maintain with him. This was the kindness of God he meant to show to him.