Mesorat%20hashas for Yevamot 42:6

אמר רב ספרא היא גופה גזירה ואנן ניקום ונגזור גזירה לגזירה אמר רבא אטו כולהו לאו גזירה לגזירה נינהו אמו ערוה אם אמו שניה וגזרו על אם אביו משום אם אמו וטעמא מאי כולהו דבי אימא רבתי קרו ליה

forbidden as a preventive measure to a preventive measure? His mother, e.g., Is a forbidden relative, his mother's mother is a forbidden relative of the second degree, and yet was his father's mother forbidden as a preventive measure against his mother's mother<span class="x" onmousemove="('comment',' Lit., 'all of them'. v. Rashi, a.l. ');">¹³</span> And what is the reason? Because they are both called 'grandmother'<span class="x" onmousemove="('comment',' Lit., 'all of them call her of the house of grandmother'. Hence the necessity for a preventive measure. ');">¹⁴</span> His father's wife is a forbidden relative, his father's father's wife is a forbidden relative of the second degree, and yet was his mother's father's wife forbidden as a preventive measure against his father's father's wife! And what is the reason? Because they are both called 'grandfather'.<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. ');">¹⁵</span>

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