But shew 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 because of Absalom thy brother.
Barzillai is now likely dead, so David charges Solomon to honor his sons by seating them at the royal table. They came to David in his flight across Jordan from Absalom and furnished him with provisions when he had nothing. Gratitude to the faithful demands this.
AI summary
But shew 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 because of Absalom thy brother. (f) That is, they dealt mercifully with me.
But show kindness unto the sons of Barzillai - See the notes on Sa2 19:31 (note), etc.