Genesis 38:9

But Onan knew the children would not count as his. So whenever he slept with his brother's wife, he spilled his seed on the ground. He did this so he would not give his brother children.

Genesis 38:9, Readable English Bible (READ)

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Previous · Genesis 38:8Then Judah said to Onan, "Sleep with your brother's wife. Do your duty as her brother-in-law. Give your brother children to carry on his name." Next · Genesis 38:10What he did was evil in the LORD's eyes. So the LORD put Onan to death too.