'Man's' in the Bible

You must not desire another man's wife, nor should you crave his house, his field, his male and female servants, his ox, his donkey, or anything else he owns."

If brothers live together and one of them dies without having a son, the dead man's wife must not remarry someone outside the family. Instead, her late husband's brother must go to her, marry her, and perform the duty of a brother-in-law.