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Genesis 38:9

9 But Onan knew that the child wouldn't be his, so whenever he slept with his brother's widow he spilled his semen on the ground so he wouldn't produce a child for his brother.

Genesis 38:9

9 But when Onan knew that the seed should not be his own, it came to pass when he went in to his brother's wife, that he spilled [it] on the ground, in order to give no seed to his brother.

Genesis 38:9

9 Onan knew that the offspring would not be his; so when he went in to his brother's wife , he wasted his seed on the ground in order not to give offspring to his brother .