Leviticus 18:16
You must not have sexual relations with your brother's wife; that would shame your brother.

Numbers 36:8, 9
Every daughter who possesses an inheritance from any Israelite tribe must marry within a clan of the tribe of her father, so that every Israelite will possess the inheritance of his fathers. . . .

Deuteronomy 25:5-10
When brothers dwell together and one of them dies without a son, the widow must not marry outside the family. Her husband's brother is to take her as his wife and fulfill the duty of a brother-in-law for her. . . .

Ruth 1:11
But Naomi replied, "Return home, my daughters. Why would you go with me? Are there still sons in my womb to become your husbands?

Ruth 4:5-11
Then Boaz said, "On the day you buy the land from Naomi and also from Ruth the Moabitess, you must also acquire the widow of the deceased in order to raise up the name of the deceased on his inheritance." . . .

Matthew 22:23-27
That same day the Sadducees, who say there is no resurrection, came to Jesus and questioned Him. . . .