The Lord has said, Let this man be recorded as having no children, a man who will not do well in all his life: for no man of his seed will do well, seated on the seat of the kingdom of David and ruling again in Judah.
And if a man has sex relations with the wife of his father's brother, he has put shame on his father's brother: their sin will be on them; till the day of their death they will have no children.
Master, Moses said that if a man's brother comes to his end, having a wife, but no children, his brother is to take the wife, and get a family for his brother.