When you go out to war against your enemies and the Lord, your God, delivers them into your power, so that you take captives, if you see a beautiful woman among the captives and become so enamored of her that you wish to have her as a wife, and so you take her home to your house, she must shave her head, cut her nails, lay aside her captive's garb, and stay in your house, mourning her father and mother for a full month. After that, you may come to her, and you shall be her husband and she shall be your wife. If later on you lose your liking for her, you shall give her her freedom, if she wishes it; you must not sell her for money. Do not enslave her, since you have violated her.
--Deuteronomy 21:10-14
The New American Bible, Revised Edition