וְאִ֗ישׁ אֲשֶׁ֥ר יִקַּ֛ח אֶת־אֵ֥שֶׁת אָחִ֖יו נִדָּ֣ה הִ֑וא עֶרְוַ֥ת אָחִ֛יו גִּלָּ֖ה עֲרִירִ֥ים יִהְיֽוּ׃
And if a man shall take his brother’s wife, it is impurity: he hath uncovered his brother’s nakedness; they shall be childless.
Targum Jonathan on Leviticus
And if a man take the wife of his brother during his life, it is an abomination: he hath dishonoured the nakedness of his brother; without children shall they be.