Reference for Yevamot 64:3

אלא היכא דנשא מת ואח"כ נשא חי מאי איסור מוסיף איכא

first<span class="x" onmousemove="('comment',' Bringing Into force the prohibition of brother's wife which is applicable to all brothers. ');">⁶</span> and the surviving brother had married<span class="x" onmousemove="('comment',' The other sister. ');">⁴</span> afterwards?<span class="x" onmousemove="('comment',' Adding the prohibition of wife's sister which, being applicable to himself only, is of a more restricted range, and cannot consequently be imposed on that of brother's wife, which preceded it. ');">⁷</span>

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