⁹ But Onan was not willing to have a child who would not be his own heir. So whenever he had intercourse with his brother's wife, he spilled the semen on the ground. This prevented her from having a child who would belong to his brother.

⁹ But since Onan knew that the offspring would not be his, he spilled his semen on the ground whenever he went in to his brother's wife, so that he would not give offspring to his brother.