1 Kings 9:20-22

As for all the people that were left of the Amorites, the Hittites, the Perizzites, the Hivites, and the Jebusites, who were not of the children of Israel; their children that were left after them in the land, whom the children of Israel were not able utterly to destroy, of them did Solomon raise a levy of bondservants unto this day. But of the children of Israel did Solomon make no bondservants; but they were the men of war, and his servants, and his princes, and his captains, and rulers of his chariots and of his horsemen.