Genesis 38:8

New International Version

Then Judah said to Onan, “Sleep with your brother’s wife and fulfill your duty to her as a brother-in-law to raise up offspring for your brother.”

Cross References

Genesis 19:31

One day the older daughter said to the younger, “Our father is old, and there is no man around here to give us children—as is the custom all over the earth.

Leviticus 18:16

“ ‘Do not have sexual relations with your brother’s wife; that would dishonor your brother.

Ruth 1:11

But Naomi said, “Return home, my daughters. Why would you come with me? Am I going to have any more sons, who could become your husbands?