Deuteronomy 21:17

21:17 Rather, he must acknowledge the son of the less loved wife as firstborn and give him the double portion of all he has, for that son is the beginning of his father’s procreative power – to him should go the right of the firstborn.

Deuteronomy 22:19

22:19 They will fine him one hundred shekels of silver and give them to the young woman’s father, for the man who made the accusation ruined the reputation of an Israelite virgin. She will then become his wife and he may never divorce her as long as he lives.

Deuteronomy 25:5

Respect for the Sanctity of Others

25:5 If brothers live together and one of them dies without having a son, the dead man’s wife must not remarry someone outside the family. Instead, her late husband’s brother must go to her, marry her, and perform the duty of a brother-in-law.