“Teacher, Moses wrote that if a married man dies and had no children, his brother must marry the woman. Then they will have children for the dead brother.
Then Boaz said, “If you buy the land from her, you must also marry the dead man’s wife, Ruth, the Moabite woman. Then the first child will get the land, and it will stay in the dead man’s family.”
Then Judah said to Er’s brother Onan, “Go and sleep with your dead brother’s wife. Become like a husband to her. If children are born, they will belong to your brother Er.”