Reference for Bava Batra 38:8

לא מיבעיא קאמר לא מיבעיא עבה כיון דאיחזי ליה לא מבטיל ליה אבל רקיק דממאיס אימא בטולי מבטיל ליה קמ"ל

R. Tobi b. Kisna said in the name of Samuel: A thin wafer does not narrow a window space.<span class="x" onmousemove="('comment',' If a dead body is in a room between which and an adjoining room there is an opening of a handbreadth square or more, the uncleanness spreads to the adjoining room unless the opening is reduced to the dimension of less than a handbreadth square by means of something which is not useful for any other purpose. ');">⁶</span>

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