5 Then Boaz said, "On the day you buy the field from the hand of Naomi and from Ruth the Moabitess, you must also aquire the wife of the dead, to raise up the name of the dead on his inheritance."
Ruth 4:5 Cross References - VIN
Genesis 38:8
8 And Judah said to Onan, Go in to your brother's wife, and marry her as her brother-in-law, and raise up seed to your brother.
Deuteronomy 25:5-6
5 "When brothers live together and one of them dies without a son the wife of the deceased shall not marry outside the family to a strange man. Her husband's brother shall marry her and perform the duty of a husband's brother to her.
6 "The firstborn son she bears will assume the name of the dead brother. That way his name will not be blotted out from Israel.
Ruth 3:12-13
Matthew 22:24
24 “Teacher,” they said, “Moses declared that if a man dies without having children, his brother is to marry the widow and raise up offspring for him.
Luke 20:28
28 and asked him, "Teacher, Moses wrote for us that if a man's brother dies and leaves a wife but no child, the man should marry the widow and have children for his brother.