Reference for Niddah 8:52

מכלל דר' דוסא אפילו שלא בשעת וסתה אמר

a pregnant woman, a woman that gives suck and an old woman; and R. Dosa ruled, For any woman who has a settled period it suffices [to reckon her period of uncleanness from] the time she discovered the discharge?<span class="x" onmousemove="('comment',' Now, since the Rabbis elsewhere differ from R. Dosa's ruling, must it be conceded that our Mishnah represents his view only? ');">⁵¹</span>

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