BSB
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.
AKJV
And Onan knew that the seed should not be his; and it came to pass, when he went in to his brother's wife, that he spilled it on the ground, lest that he should give seed to his brother.
CPDV
He, knowing that the sons to be born would not be his, when he entered to the wife of his brother, he spilled his seed on the ground, lest children should be born in his brother's name.
ERV
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 he should give seed to his brother.
NHEB
But Onan knew that the offspring wouldn't be his. So it happened when he slept with his brother's wife that he released his semen on the ground, so that he would not produce offspring for his brother.
SMT
And Onan will know that not to him will be the seed; and it was when he went in to his brother's wife, he destroyed upon the earth, not to give seed to his brother.