Mesorat%20hashas for Chullin 250:34

טומאה בבית מה שבתוכה טהור

And the next clause reads thus: If one set [the cupboard] in the doorway of the house and it [the cupboard] opened outwards, and there was some uncleanness in it, the house remains clean;<span class="x" onmousemove="('comment',' For the uncleanness will not pass through the house at all and as there was the space of a cubic handbreadth in the cupboard the uncleanness in it cannot break through.');">²⁰</span>

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