Reference for Menachot 194:7

הא קא יהיב עליונה למטה משני טפחים

And we have learnt:<span class="x" onmousemove="('comment',' Mid. III, 1.');">⁹</span> A red line went around the altar in the middle<span class="x" onmousemove="('comment',' I.e., twenty-seven handbreadths above the ground.');">¹⁰</span>

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