Who hath betrothed her to himself — For a concubine, or secondary Wife. Not that Masters always took Maid — servants on these terms.
Related Commentaries of Exodus 21:8
Exodus 21:8
8 If she pleaseb not her master, who hath betrothed her to himself, then shall he let her be redeemed: to sell her unto a strange nation he shall have no power, seeing he hath dealt deceitfully with her.