Genesis 38:9 WBT

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.

¹⁰  And the thing which he did displeased the LORD: wherefore he slew him also.

¹¹  Then said Judah to Tamar his daughter-in-law, Remain a widow at thy father's house, till Shelah my son shall be grown; (for he said, Lest perhaps he die also as his brethren [did]:) and Tamar went and dwelt in her father's house.