Deuteronomy:25:5-6
strkjv@Deuteronomy:25:5 @ 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 H2114: her husbands brother shall go in unto her, and take her to him to wife, and perform the duty of an husbands brother unto her.
strkjv@Deuteronomy:25:6 @ And it shall be, that the firstborn which she beareth shall succeed in the name of his brother which is dead, that his name be not put out of Israel.