And she conceived again and bore a son, and he called his name Onan.

Then Judah said to Onan, "Go in to the wife of your brother and perform the duty of a brother-in-law to her, and raise up offspring for your brother."

But Onan knew that the offspring would not be for him, so whenever he went in to the wife of his brother he would waste [it] on the ground so as not to give offspring to his brother.

The sons of Judah: Er, Onan, Shelah, Perez, and Zerah (but Er and Onan died in the land of Canaan). And the sons of Perez were Hezron and Hamul.