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: her husband's brother H2993 shall go in unto her, and take her to him to wife, and perform the duty of an husband's brother unto her.
Deuteronomy 25:7 - And if the man like not to take his brother's wife, then let his brother's wife go up to the gate unto the elders, and say, My husband's brother H2993 refuseth to raise up unto his brother a name in Israel, he will not perform the duty of my husband's brother.