Leviticus 25
44 Ref But you may get servants as property from among the nations round about; from them you may take men-servants and women-servants.
45 Ref And 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.
46 Ref And 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.