Deuteronomy 25:5

In Deuteronomy 25 of Deuteronomy.

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 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.

The King James Version (1769) is in the public domain in the United States.