Reference for Yevamot 41:20

וזעירי להתם שכיח ואזיל להכא לא שכיח ואזיל

Of these Rab knew<span class="x" onmousemove="('comment',' Lit., 'held in his hand'. ');">⁵⁰</span> three: The wife of a mother's<span class="x" onmousemove="('comment',' But not, e.g., of a mother's mother's. ');">⁵¹</span> paternal brother, the wife of a father's<span class="x" onmousemove="('comment',' Not of a father's father's. ');">⁵²</span>

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