Genesis 38:8

New King James Version

And Judah said to Onan, “Go in to your brother’s wife and marry her, and raise up an heir to your brother.”

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But Naomi said, “Turn back, my daughters; why will you go with me? Are there still sons in my womb, that they may be your husbands?

You shall not uncover the nakedness of your brother’s wife; it is your brother’s nakedness.

Now the firstborn said to the younger, “Our father is old, and there is no man on the earth to come in to us as is the custom of all the earth.