Genesis 38:8-10

Amplified Bible, Classic Edition

⁸ Then Judah told Onan, Marry your brother’s widow; live with her and raise offspring for your brother.

⁹ But Onan knew that the family would not be his, so when he cohabited with his brother’s widow, he prevented conception, lest he should raise up a child for his brother.

¹⁰ And the thing which he did displeased the Lord; therefore He slew him also.