Genesis 38:8-10

21st Century King James Version

⁸ And Judah said unto Onan, “Go in unto thy brother’s wife and marry her, and raise up seed to thy brother.”

⁹ And Onan knew that the seed should not be his; and it came to pass, when he went in unto his brother’s wife, that he spilled it on the ground, lest he should give seed to his brother.

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