Related for Yevamot 74:5

יתר על כן אמר ר' אליעזר בן יעקב לא ישא אדם אשה במדינה זו וילך וישא אשה במדינה אחרת שמא יזדווגו זה לזה ונמצא אח נושא את אחותו

might marry one another and the result might be that a brother would marry his sister.<span class="x" onmousemove="('comment',' Yoma 18b. ');">⁸</span> But, surely, this could not be [the accepted ruling], for Rab, whenever he happened to visit Dardeshir,<span class="x" onmousemove="('comment',' [Ardashir, a town near Mahuza. V. Obermeyer pp. 164ff and 175, n, 1.]. ');">⁹</span>

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