Genesis 38:6-8

King James Version

⁶ And Judah took a wife for Er his firstborn, whose name was Tamar.

⁷ And Er, Judah's firstborn, was wicked in the sight of the Lord; and the Lord slew him.

⁸ And Judah said unto Onan, Go in unto thy brother's wife, and marry her, and raise up seed to thy brother.