Genesis 38:8

New American Bible - revised edition

Then Judah said to Onan, “Have intercourse with your brother’s wife, in fulfillment of your duty as brother-in-law, and thus preserve your brother’s line.”

Cross References

Ruth 1:11

Naomi replied, “Go back, my daughters. Why come with me? Have I other sons in my womb who could become your husbands?

Leviticus 18:16

You shall not have intercourse with your brother’s wife; that would be a disgrace to your brother.

Genesis 19:31

The firstborn said to the younger: “Our father is getting old, and there is not a man in the land to have intercourse with us as is the custom everywhere.