2 Chronicles 8:6-10

and Baalath and all the storage cities that Solomon had, and all the cities for his chariots and cities for his horsemen, and everything that it pleased Solomon to build in Jerusalem, Lebanon, and all the land under his rule.

All of the people who were left of the Hittites, the Amorites, the Perizzites, the Hivites, and the Jebusites, who were not of Israel,

that is, from their descendants who were left after them in the land, whom the sons of Israel had not destroyed, Solomon raised them as forced laborers to this day.

But Solomon did not make slaves from the sons of Israel for his work; for they were men of war, his chief captains and commanders of his chariots and his horsemen.

These were the chief officers of King Solomon, 250 who ruled over the people.