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 (d) 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.
(d) Because the Hebrew word does not signify the natural brother, and the word that signifies a brother, is taken also for a kinsman: it seems that it does not mean that the natural brother should marry his brothers wife, but some other kindred that was in the degree that might marry.