Reference for Niddah 109:3

אמר קרא (ויקרא טו, י) והנושא אותם אותם מיעוטא הוא

so does her blood also convey uncleanness to objects under a heavy stone? — R. Ashi replied: Scripture said, And he that beareth those things,<span class="x" onmousemove="('comment',' Lev. XV, 10, dealing with the couch of a zab which (as explained in Torath Kohanim) when carried on a heavy stone conveys uncleanness to objects under the stone. ');">³</span>

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