Reference for Niddah 67:21

זובו דלא תלי במעשה גזרו ביה רבנן קריו דתלי במעשה לא גזרו ביה רבנן

— Since a distinguishing rule has been laid down in regard to her blood<span class="x" onmousemove="('comment',' By imposing upon it an uncleanness that is less restrictive than that of Pentateuchal uncleanness. ');">¹⁹</span>

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