Reference for Niddah 5:41

מודה שמאי בכתמים מ"ט בצפור לא נתעסקה בשוק של טבחים לא עברה האי דם מהיכא אתי

This is Shammai's reason:<span class="x" onmousemove="('comment',' For his ruling that menstruants begin their period of uncleanness from the time OF THEIR DISCOVERING OF THE FLOW only and not, as in the case of the alley, retrospectively. ');">³⁷</span>

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