1 Kings 10:15 - Wesley's Explanatory Notes

Merchant — men — Heb. of the searchers; either merchants, who use to search out commodities: or, the gatherers of the king's revenues, who used to search narrowly into all wares, that the king might not be defrauded of his rights. Spice — merchants — Or rather, of the merchants in general, as the word is often used. So this and the former particular contain both the branches of the king's revenue, what he had from the land, and what he had from the merchants and traders. Kings — Of those parts of Arabia which were next to Canaan, which were either conquered by David, or submitted to pay tribute to Solomon. But we must not think all these to be kings of large dominions; many of them were only governors of cities, and the territories belonging to them, such as were formerly in Canaan, and were anciently called kings. The country — Or, of the land; the land of Arabia: whereof some parts were so far conquered, that he had governors of his own over them, who were each of them to take care of the king's revenue in his jurisdiction; and part only so far, that they still had kings of their own, but such as were tributaries to him.