Leviticus 20:21

20:21 "'If a man takes his brother's wife, it is an impurity: he has uncovered his brother's nakedness; they shall be childless.
-World English Bible

Other Translation

20:21 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.
-King James Version