(Slavery) Only Foreigners: Leviticus 25:42-46

The people of Israel are the LORD's slaves, and he brought them out of Egypt; they must not be sold into slavery. Do not treat them harshly, but obey your God. If you need slaves, you may buy them from the nations around you. You may also buy the children of the foreigners who are living among you. Such children born in your land may become your property, and you may leave them as an inheritance to your children, whom they must serve as long as they live. But you must not treat any Israelites harshly. -Leviticus 25:42-46