Leviticus 25:45 (KJV)
Moreover of the children of the strangers that do sojourn among you, of them shall ye buy, and of their families that are with you, which they begot in your land: and they shall be your possession.
Moreover of the children of the strangers that do sojourn among you, of them shall ye buy, and of their families that are with you, which they begot in your land: and they shall be your possession.