Translations
But Onan knew that any child born would not count as his heir, so whenever he slept with his brother's wife, he spilled his seed on the ground rather than give children to his brother.
But Onan knew the seed would not be counted as his, so whenever he went in to his brother's wife he would spill it on the ground, so as not to give seed to his brother.
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.
But Onan knew that the offspring would not belong to him; so whenever he would sleep with his brother’s wife, he would spill his seed on the ground so that he would not produce offspring for his brother.

