Leviticus 25:44-49

⁴⁴But you may get servants as property from among the nations round about; from them you may take men-servants and women-servants.

⁴⁵And in addition, you may get, for money, servants from among the children of other nations who are living with you, and from their families which have come to birth in your land; and these will be your property.

⁴⁶And they will be your children's heritage after you, to keep as their property; they will be your servants for ever; but you may not be hard masters to your countrymen, the children of Israel.

⁴⁷And if one from another nation living among you gets wealth, and your countryman, at his side, becomes poor and gives himself for money to the man from another nation or to one of his family;

⁴⁸After he has given himself he has the right to be made free, for a price, by one of his brothers,

⁴⁹Or his father's brother, or the son of his father's brother, or any near relation; or if he gets money, he may make himself free.