Commentary for Yevamot 40:14

אלא אמר רבא גזרה ביאה ראשונה אטו ביאה שניה

is a preventive measure against [a marriage] where no precept is applicable. If so, let one's paternal brother's wife not be allowed levirate marriage as a preventive measure against marriage with the wife of his maternal brother! — 'We All Merciful made levirate marriage dependent on inheritance<span class="x" onmousemove="('comment',' Supra 17b, infra 240. ');">²⁴</span> [and the relationship] is, therefore, well known.<span class="x" onmousemove="('comment',' Everybody knows whether the brother is paternal or only maternal. ');">²⁵</span>

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