Reference for Yoma 22:6

לא נחלקו אלא בגבוהה י' ויש ברגלה ג' ואין ברחבה ד' ויש בה לחוק להשלימה לארבעה ר"מ סבר חוקקין להשלים ורבנן סברי אין חוקקין להשלים

gate, a gate without beams and a gate that is not ten handbreadths high. He [Raba] said to him: You started by saying six and you ended up with seven? -He replied: There is Tannaitic division of opinion concerning the Median gate, for it has been taught: An arched doorway<span class="x" onmousemove="('comment',' Which is the same as a Median gate.');">⁷</span>

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