Then Judah said to Onan, “Have sexual relations with ¹  your brother’s wife and fulfill the duty of a brother-in-law to her so that you may raise ²  up a descendant for your brother.” ³ 

If brothers live together and one of them dies without having a son, the dead man’s wife must not remarry someone outside the family. Instead, her late husband’s brother must go to her, marry her, ¹  and perform the duty of a brother-in-law. ² 

But if the man does not want to marry his brother’s widow, then she ¹  must go to the elders at the town gate and say, “My husband’s brother refuses to preserve his brother’s name in Israel; he is unwilling to perform the duty of a brother-in-law to me!”