Genesis 38:7-10
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7 And Er, Judah's firstborn, was wicked in the sight of the LORD; and the LORD slew him.
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8 And Judah said unto Onan, Go in unto thy brother's wife, and marry her, and raise up seed to thy brother.
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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.
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10 And the thing which he did displeased the LORD: wherefore he slew him also.