Leviticus 25:42-46

⁴²Because these are my servants, whom I brought out of the land of Egypt; such an one shall not be sold as a common servant.

⁴³You shall not oppress him with labour, and shall fear the Lord your God.

⁴⁴And whatever number of menservants and maidservants you shall have, you shall purchase male and female servants from the nations that are round about you.

⁴⁵And of the sons of the sojourners that are amongst you, of these you° shall buy and of their relations, all that shall be in your lands; let them be to you for a possession.

⁴⁶And you° shall distribute them to your children after you, and they shall be to you permanent possessions for ever: but of your brethren the children of Israel, one shall not oppress his brother in labours.