Genesis 38:6 DBY

⁴  And she again conceived and bore a son, and she called his name Onan.

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

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

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

⁸  Then Judah said to Onan, Go in to thy brother's wife, and fulfil to her the brother-in-law's duty, and raise up seed to thy brother.