Reference for Niddah 98:20

לאתויי סאה ותרקב דתניא

as it might have been presumed that if the <i>zab</i> inverted a <i>se'ah</i> measure and sat upon it or a <i>tarkab</i> measure and sat upon it, it shall be unclean,<span class="x" onmousemove="('comment',' Midras-uncleanness that is conveyed to men and objects which become thereby a 'father of uncleanness'. ');">¹⁹</span>

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