Deuteronomy 25:5-7

Amplified Bible

⁵ “If brothers are living together and one of them dies without a son, the widow of the deceased shall not be married outside the family to a stranger. Her husband’s brother shall be intimate with her after taking her as his wife and perform the duty of a husband’s brother to her. ⁶ It shall be that her firstborn [son] will ^[a]be given the name of the dead brother, so that his name will not be blotted out of Israel. ⁷ But if the man does not want to marry his brother’s [widowed] wife, then she shall go up to the gate [of the city, where court is held] to the elders, and say, ‘My brother-in-law refuses to continue his brother’s name in Israel; he is not willing to perform the duty of a husband’s brother.’