Here again, beside the moral lesson taught of doing what is just and right, here is a spiritual intimation of the betrothing of the heart to the Lord intended from it. The humblest of the Lord's freemen cannot be sold for bondage to a strange nation. John 8:36.
Related Commentaries of Exodus 21:7
Exodus 21:7-11
7 And if a man sell his daughter to be a maidservant, she shall not go out as the menservants do.
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.
9 And if he have betrothed her unto his son, he shall deal with her after the manner of daughters.
10 If he take him another wife; her food, her raiment, and her duty of marriage, shall he not diminish.
11 And if he do not these three unto her, then shall she go out free without money.