Treasury of Scripture Knowledge
And Naomi said, Turn again, my daughters: why will ye go with me? are there yet any more sons in my womb, that they may be your husbands?
Then Judah said to his daughter-in-law Tamar, “
Remain a widow in your father’s house until my son Shelah grows up”; for he thought, “I am afraid that he too may die like his brothers.” So Tamar went and lived in her father’s house.
“When brothers live together and one of them dies and has no son, the wife of the deceased shall not be married outside the family to a strange man.
Her 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.
Then Judah said to Onan, “
Go in to your brother’s wife, and perform your duty as a brother-in-law to her, and raise up offspring for your brother.”
and they questioned Him, saying, “Teacher, Moses wrote for us that
if a man’s brother dies, having a wife, and he is childless, his brother should marry the wife and raise up children to his brother.