Adam Clarke on 1 Chronicles 12:39

They were with David three days - These were the deputies of the different people mentioned here: it is not possible that all the thousands mentioned above could have feasted with David for three days; and yet it appears there was even of these a great number, for the men of Issachar, Zebulun, and Naphtali, who were nearest to this place of rendezvous, had brought all the necessaries for such a feast. From the whole it appears most evident that the great majority of the tribes of Israel wished to see the kingdom confirmed in the hands of David; nor was there ever in any country a man more worthy of the public choice. As a statesman, warrior, hero, poet, and divine, he stands unrivalled in the annals of the world: by him alone were the Israelites raised to a pitch of the highest splendor; and their name became a terror to their enemies, and a praise in the earth. But, alas, how are the mighty now fallen!