Ruth 4:5

What day... — When the person had been bought out to whom Naomi had sold the land until the year of Jubilee should restore it to her family, there remained Naomi’s own claim on the land, and after wards that of Ruth, as the widow of the son of Elimelech. But further, this last carried with it the necessity of taking Ruth to wife, so that a child might be born to inherit, as the son of Mahlon, Mahlon’s inheritance.