Reference for Chullin 109:12

והתניא

But it has been taught: If the vessel, when unbroken, could hold exactly a log it must be regarded as holding less, or if exactly a se'ah it must be regarded as holding less, or if exactly two se'ahs it must be regarded as holding less.<span class="x" onmousemove="('comment',' It is evident from this Baraitha that 'up to' is always inclusive.');">⁵</span>

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