Reference for Chullin 248:10

רבי ישמעאל הא דאמרן רבי דוסא בן הרכינס דתנן

which causes uncleanness in a 'tent'<span class="x" onmousemove="('comment',' By overshadowing, i.e., which renders unclean everything which happens to be in the same tent or under the same roof space as the unclean matter. Cf. Num. XIX, 14.');">⁸</span>

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