Exodus 21:8

If she please not her master, who hath betrothed her to himself, that is, who had purchased her with the expectation of making her his wife or concubine, then shall he let her be redeemed by some other man who might desire her for his wife. To sell her unto a strange nation he shall have no power, seeing he hath dealt deceitfully with her, he has broken faith with her, for she came to him, although her father sold her for reasons of poverty, Leviticus 25:39, with the understanding that she was to occupy the position of wife or concubine. Hebrew girls were not to be sold into unconditional slavery to members of other nations.