Reference for Niddah 115:23

על שוקה ועל פרסותיה מבפנים וכו'

because [direct dropping of blood] might occur while she is walking. But do we not [as regards] uncleanness presume transfer from place to place? Was it not in fact taught: If it<span class="x" onmousemove="('comment',' A bloodstain. ');">²¹</span>

Jastrow

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