Genesis 38:6-8

Complete Jewish Bible

⁶ Y’hudah took a wife for ‘Er his firstborn, and her name was Tamar. ⁷ But ‘Er, Y’hudah’s firstborn, was evil from Adonai’s perspective, so Adonai killed him. ⁸ Y’hudah said to Onan, “Go and sleep with your brother’s wife — perform the duty of a husband’s brother to her, and preserve your brother’s line of descent.”