5.1.1.6 Two laws discuss the treatment of unfree women acquired as wives in divergent ways.
a) The "amah of the Book of the Covenant (Exod. 21:7–10) is an Israelite woman sold for this status by her father. If the buyer has designated her for his son, she is treated like any other daughter in-law, becomes a wife, and is not freed in the seventh year. If the man for whom she was acquired as a wife did not want her, he could “redeem her” to another family but he could not sell her, for his not marrying her was considered a betrayal. If he married another woman, he had to keep providing for his "amah; if not, she would go free. The debt for which her father may have sold her is cancelled, but she would not get back any monetary payment to her father, for it was not considered a bride-price. Deuteronomy explicitly frees both male and female Hebrew slaves in the seventh year, an indication that there were no more "amah arrangements for acquiring wives.
b) Deuteronomy provides for capturing a wife in war (Deut. 21:10–14). Brought home, she was to perform transition rituals—shaving her head, cutting her fingernails, and changing her clothes. She was also to “mourn her father and her mother” for a month, after which her captor could consummate the marriage. As with the "amah of Exodus, the captive bride could not be treated as an ordinary slave and sold. Changing his mind was considered abuse, and if he did not want her, she would go free.
~Vol. 2, pg. 1008