King James Version
And if a man shall take his brother's wife, it is an unclean thing: he hath uncovered his brother's nakedness; they shall be childless.English Standard Version
If a man takes his brother's wife, it is impurity. He has uncovered his brother's nakedness; they shall be childless.New International Version
"'If a man marries his brother's wife, it is an act of impurity; he has dishonored his brother. They will be childless.