Genesis 38:10 YLT

⁸  And Judah saith to Onan, 'Go in unto the wife of thy brother, and marry her, and raise up seed to thy brother;'

⁹  and Onan knoweth that the seed is not 'reckoned' his; and it hath come to pass, if he hath gone in unto his brother's wife, that he hath destroyed 'it' to the earth, so as not to give seed to his brother;

¹⁰  and that which he hath done is evil in the eyes of Jehovah, and He putteth him also to death.

¹¹  And Judah saith to Tamar his daughter-in-law, 'Abide a widow at thy father's house, till Shelah my son groweth up;' for he said, 'Lest he die -- even he -- like his brethren;' and Tamar goeth and dwelleth at her father's house.

¹²  And the days are multiplied, and the daughter of Shuah, Judah's wife, dieth; and Judah is comforted, and goeth up unto his sheep-shearers, he and Hirah his friend the Adullamite, to Timnath.