Deuteronomy 21:10-17

¹⁰And if when you go out to war against your enemies, the Lord your God should deliver them into your hands, and you should take their spoil,

¹¹and should see amongst the spoil a woman beautiful in countenance, and should desire her, and take her to yourself for a wife,

¹²and should bring her within your house: then shall you shave her head, and pare her nails;

¹³and shall take away her garments of captivity from off her, and she shall abide in your house, and shall bewail her father and mother the days of a month; and afterwards you shall go in to her and dwell with her, and she shall be your wife.

¹⁴And it shall be if you do not delight in her, you shall send her out free; and she shall not by any means be sold for money, you shall not treat her contemptuously, because you have humbled her.

¹⁵And if a man have two wives, the one loved and the other hated, and both the loved and the hated should have born him children, and the son of the hated should be firstborn;

¹⁶then it shall be that whenever he shall divide by inheritance his goods to his sons, he shall not be able to give the right of the firstborn to the son of the loved one, having overlooked the son of the hated, which is the firstborn.

¹⁷But he shall acknowledge the firstborn of the hated one to give to him double of all things which shall be found by him, because he is the first of his children, and to him belongs the birthright.