הלכה אויף דברים 21:14

In all, she must wait three months: one month of wailing, and two months thereafter. He then may marry her with a Kesuba (marriage contract) and Kiddushin (sanctification). If he does not want her, he releases her on her own. If he sells her⁷⁶As a maidservant., he violates the Negative Commandment “and you may not sell her for money, you shall not deal with her as a slave, because you have humbled her” (Deut. 21:14). The sale is invalid and he must return the money. If he first had relations with her and then seized her for the purposes of making her a maidservant, once he uses her as such, he violates a Negative Precept, as it says, “you shall not deal with her as a slave” (Deut. 21:14), that is, he must not have her serve him.

Not to sell a beautiful woman, (taken captive in war), as it is said, “…thou shalt not sell her for money (Deut. 21:14).

Not to degrade a beautiful woman (taken captive in war) to the condition of a bondwoman, as it is said, “Thou shalt not make merchandise^**According to Sifré, quoted by Maimonides in the Sefer-Ha-Mitzvoth, “make menial use of her”. of her” (ibid. 21:14).