Deuteronomy 25:5-6

New King James Version

Marriage Duty of the Surviving Brother

^5 (A)“If brothers dwell together, and one of them dies and has no son, the widow of the dead man shall not be married to a stranger outside the family; her husband’s brother shall go in to her, take her as his wife, and perform the duty of a husband’s brother to her. ⁶ And it shall be that the firstborn son which she bears ^(B)will succeed to the name of his dead brother, that ^(C)his name may not be blotted out of Israel.