Mesorat%20hashas for Chullin 251:26

רב אחא בריה דרבא מתני לה בהדיא רבי יוסי אומר

hence you can deduce [that he holds], concealed uncleanness breaks through! - Said Raba: He [R'Jose] means to say: 'We must consider the space in connection with the uncleanness';<span class="x" onmousemove="('comment',' Where there is in the neck a space of one handbreadth, the uppermost side of the neck would serve as a 'tent' and would lead the uncleanness into the house. Where, however, there is no space of a handbreadth in the neck, even though the neck in which the uncleanness lies is entirely within the house, the house is clean, for the uncleanness is concealed and cannot break through.');">¹⁴</span>

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