Ki Tetze (when you go) out to war

When Israel goes to war

Deuteronomy 21:10 When you go out to war against your enemies and יהוה your Elohim has delivered them into your hands and you have taken them captive, 11 If you see among the captives a beautiful woman and have a desire for her, that you want her to be your אשֶׁת wife; 12 Then you can bring her home to your house; and she must shave את־ her head and trim את־ her nails; 13 And she must take את־ the garments of her captivity off and remain in your house and mourn את־ her father וְאת־ and her mother for a full month: and after that you can go in to her and be her husband and she will be your wife. 14 But if you lose interest in her, then you must let her go where she wants to go; but you must not sell her for money, you must not treat her like a slave, because you have humbled her. C-MATS

Question: Why does Torah provide an avenue for the lustful soldier to take a beautiful captive as a wife? Rather than risk sin that may lead to rape or fornication, the Torah provides an avenue for the lustful soldier to satisfy his desire, so that it will cool before it causes more harm. The soldier may not molest the woman then, but he is permitted to put her through the process described below, after which he may marry her, even against her wishes; and since he knows that she will become permitted to him later, he will be willing to wait, rather than sin. The captive woman remains in the home of her captor for a period of time, during which her state of mourning and general dishevelment will make her unattractive, so that he will lose interest and set her free. Chumash

Question: Why is the law about a beautiful captive placed next to the law about a hated wife and a rebellious child? The implication is that there is a chain reaction: This improper infatuation with a captive woman will lead to one family tragedy after another. She will become a hated wife and give birth to a rebellious child (Rashi). Chumash

Deuteronomy 21:15 If a man has two wives, הָאחַת the one loved and the other hated and they both bear him children and if the firstborn son is from the woman who is hated: 16 Then when it comes time for him to pass his inheritance to את־ his sons את which he has may not begiven to the firstborn את־ son of the loved wife before the firstborn son of the hated wife: 17 But את־ the firstborn son of the hated wife, he will acknowledge by giving him a double portion of all that he has: because he is the firstfruits of his manhood; the right of the firstborn is his. C-MATS

Question: What is a double portion? The firstborn son takes a share equal to that of two brothers together. If a man with four sons divided up his inheritance, he divided the inheritance into five equal shares, giving two shares to the firstborn and one share to each of the other three sons. Chumash