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.