Mesorat%20hashas for Yevamot 42:7
אשת אביו ערוה אשת אבי אביו שניה וגזרו על אשת אבי אמו משום אשת אבי אביו וטעמא מאי כולהו דבי אבא רבה קרו ליה
The wife of his father's paternal brother is a forbidden relative, the wife of his father's maternal brother is a forbidden relative of the second degree, and yet was the wife of his mother's paternal brother forbidden as a preventive against the wife of his father's maternal brother! And what is the reason? Because they are both called uncle!<span class="x" onmousemove="('comment',' Cf. previous note mutatis mutandis. All of which shews that we do superimpose a Preventive measure upon a preventive measure. ');"><sup>15</sup></span> What, then, is the law?<span class="x" onmousemove="('comment',' With respect to the wife of a mother's maternal brother. ');"><sup>16</sup></span> Come and hear: When R. Judah b. Shila came<span class="x" onmousemove="('comment',' From Palestine to Babylon. ');"><sup>17</sup></span>
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