Onan knew that the seed wouldn't be his; and it happened, when he went in to his brother's wife, that he spilled it on the ground, lest he should give seed to his brother.
The LORD will not pardon him, but then the anger of the LORD and his jealousy will smoke against that man, and all the curse that is written in this book shall lie on him, and the LORD will blot out his name from under the sky.