Deuteronomy 25:5-6
Read Deuteronomy 25 in full →5“If brothers live together and one of them dies and has no son, then the wife of the one who died shall not be married outside the family to a strange man. aHer husband’s brother shall go in to her and take her to himself as wife and perform the duty of a husband’s brother to her. 6“And it will be that the firstborn whom she bears shall 1assume the name of his dead brother, so that ahis name will not be blotted out from Israel.