Reference for Chullin 49:5

(במדבר יט, טו) וכל כלי פתוח אשר אין צמיד פתיל עליו איזהו כלי שטומאתו קודמת לפתחו

And [the verse teaches that] if it has no covering close-bound upon it is unclean, but if it has a covering close-bound upon it it is clean.<span class="x" onmousemove="('comment',' Hence it is proved that an earthenware vessel cannot be rendered unclean from the outside. ufu,');">⁴</span>

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