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.

⁹ But Onan knew that the child would not be his; so whenever he slept with his brother's wife, he spilled his semen on the ground to keep from providing offspring for his brother.

⁹ 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.

⁹ 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.