Genesis 38:9-10
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 that he should give seed to his brother.
10
And the thing which he did displeased the LORD: wherefore he slew him also.
Bible text: King James Version (1769 Blayney text) · Public domain