Genesis 38:8

Then the firstborn said to the younger, “Our father is old, and there is not a man on earth to come in to us after the manner of the earth.

Then Boaz said, “On the day you acquire the field from the hand of Naomi, you must also acquire Ruth the Moabitess, the widow of the one who had died, in order to raise up the name of the one who had died, on behalf of his inheritance.”

The sons of Judah were Er, Onan, and Shelah; these three were born to him by Bath-shua the Canaanitess. And Er, Judah’s firstborn, was evil in the sight of Yahweh, so He put him to death.