Reference for Niddah 8:54

אשה שיש לה וסת כתמה טמא למפרע שאם תראה שלא בשעת וסתה מטמאה מעת לעת נימא רבנן היא ולא רבי דוסא ...

but [in the case of one that did occur] at her set time they might agree with him; and our Mishnah deals with a flow that occurred at the woman's set time and it, therefore, represents the view of both.<span class="x" onmousemove="('comment',' Lit., 'and the words of all', those of the Rabbis as well those of R. Dosa. ');">⁵³</span>

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