Genesis 38:7 WBT

⁵  And she yet again conceived, and bore a son; and called his name Shelah: and he was at Chezib, when she bore him.

⁶  And Judah took a wife for Er his first-born, whose name [was] Tamar.

⁷  And Er, Judah's first-born, was wicked in the sight of the LORD; and the LORD slew him.

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

⁹  And Onan knew that the seed would not be his: and it came to pass, when he went in to his brother's wife, that he frustrated the purpose, lest he should give seed to his brother.