John Gill Commentary 1 Kings 2:7

"But show kindness unto the sons of Barzillai the Gileadite, and let them be of those that eat at thy table; for so they came to me when I fled from Absalom thy brother." — 1 Kings 2:7 (ASV)

But show kindness to the sons of Barzillai the Gileadite Who perhaps was now dead, and therefore he would have kindness shown to his posterity for his sake:

and let them be of those that eat of your table ; as Mephibosheth had at his, who also perhaps was dead, since no notice is taken of him; and as David would have had Barzillai, but he desired to be excused on account of his age:

for so they came to me, when I fled because of your brother, Absalom ; that is, they came to him, not only Barzillai, but his sons it seems; and fed him or furnished him with provisions, when he was obliged to fly to the other side Jordan, because of the rebellion of his son Absalom.