Genesis 38:7-9

New International Reader's Version

⁷ But Judah’s oldest son Er was evil in the Lord’s eyes. So the Lord put him to death.

⁸ Then Judah said to Onan, “Sleep with your brother’s wife. After all, you are her brother-in-law. So carry out your duty to her. Provide children for your brother.” ⁹ But Onan knew that the children wouldn’t belong to him. So every time he slept with his brother’s wife, he spilled his semen on the ground. He did it so he wouldn’t provide children for his brother.