5 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.”
Ruth 4:5 Cross References - BSB
Genesis 38:8
8 Then Judah said to Onan, “Sleep with your brother’s wife. Perform your duty as her brother-in-law and raise up offspring for your brother.”
Deuteronomy 25:5-6
5 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.
6 The first son she bears will carry on the name of the dead brother, so that 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 “Teacher,” they said, “Moses wrote for us that if a man’s brother dies and leaves a wife but no children, the man is to marry his brother’s widow and raise up offspring for him.