quando habitaverint fratres simul et unus ex eis absque liberis mortuus fuerit uxor defuncti non nubet alteri sed accipiet eam frater eius et suscitabit semen fratris sui
If brethren dwell together, and one of them die, and have no child, the wife of the dead shall not marry without unto a stranger: her husband's brother shall go in unto her, and take her to him to wife, and perform the duty of an husband's brother unto her.