Reference for Niddah 131:39

כי היכי דתהוו עליך להך גיסא נתהוו עלך להך גיסא

R. Joseph citing Rab Judah who had it from Rab stated: Rabbi ordained at Sadoth,<span class="x" onmousemove="('comment',' A place that was inhabited by unlettered people who were incapable of calculating the dates of the menstrual, and the zibah periods. ');">³²</span>

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