Reference for Zevachim 123:1

ולא על גבי מחילות

or over cellars.<span class="x" onmousemove="('comment',' But that did not exclude the possibility of its being hollow.');">¹</span> R'Joseph said: Is that not which was taught: And they set the altar upon its bases,<span class="x" onmousemove="('comment',' Ezra III, 3.');">²</span>

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