“Teacher, Moses wrote for us that if a man’s brother dies and leaves his wife behind, but leaves no children, that man must take the wife and raise up children for his brother.
If brothers dwell together, and one of them dies without having had a child, the wife of the deceased may not marry outside the family to a stranger. Her husband’s brother must go to her and take her to himself as a wife and perform the duty of a husband’s brother to her.