5. Mose 21:10

Treatment of a Wife who had been a Prisoner of War. - If an Israelite saw among the captives, who had been brought away in a war against foreign nations, a woman of beautiful figure, and loved her, and took her as his wife, he was to allow her a month's time in his house, to bewail her separation from her home and kindred, and accustom herself to her new condition of life, before he married her. What is said here does not apply to the wars with the Canaanites, who were to be cut off (vid., Deu 7:3), but, as a comparison of the introductory words in Deu 21:1 with Deu 20:1 clearly shows, to the wars which Israel would carry on with surrounding nations after the conquest of Canaan. שׁבי and שׁביה, the captivity, for the captives.

By this law a soldier is allowed to marry his captive if he pleased. For the hardness of their hearts Moses gave them this permission, lest, if they had not had liberty given them to marry such, they should have taken liberty to defile themselves with them, and by such wickedness the camp would have been troubled. The man is supposed to have a wife already, and to take this wife for a secondary wife, as the Jews called them. This indulgence of men's inordinate desires, in which their hearts walked after their eyes, is by no means agreeable to the law of Christ, which therefore in this respect, among others, far exceeds in glory the law of Moses. The gospel permits not him that has one wife to take another, for from the beginning it was not so. The gospel forbids looking upon a woman, though a beautiful one, to lust after her, and commands the mortifying and denying of all irregular desires, though it be as uneasy as the cutting off of a right hand; so much does our holy religion, more than that of the Jews, advance the honour and support the dominion of the soul over the body, the spirit over the flesh, consonant to the glorious discovery it makes of life and immortality, and the better hope. But, though military men were allowed this liberty, yet care is here taken that they should not abuse it, that is, I. That they should not abuse themselves by doing it too hastily, though the captive was ever so desirable: "If thou wouldest have her to thy wife (Deu 21:10, Deu 21:11), it is true thou needest not ask her parents' consent, for she is thy captive, and is at thy disposal. But, 1. Thou shalt have no familiar intercourse till thou hast married her." This allowance was designed to gratify, not a filthy brutish lust, in the heat and fury of its rebellion against reason and…