Reference for Niddah 37:61

שחור כחרת עמוק מכן טמא דיהה אפי' ככחול טהור

BUT BETH HILLEL DECLARE THESE CLEAN. Is not this ruling identical with that of the first Tanna?<span class="x" onmousemove="('comment',' In the first clause of our Mishnah. ');">⁵¹</span>

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