And David commanded to gather together the strangers that were in the land of Israel; and he set masons to hew wrought stones to build the house of God. (1 Chronicles 22:2)
That is, non-Israelite residents of Palestine. They were employed in various types of forced service from which the Israelites were exempted (see 1 Kings 9:20-22; 2 Chron. 8:7-9).