Reference for Bava Batra 197:3
אמר רבנאי אמר שמואל כרובים בנס הן עומדין שנאמר (מלכים א ו, כד) וחמש אמות כנף הכרוב האחת וחמש אמות כנף הכרוב השנית עשר אמות מקצות כנפיו ועד קצות כנפיו גופייהו היכא הוו קיימי אלא שמע מינה בנס הן עומדין
The Ark which Moses made had a free space of ten cubits on every side.<span class="x" onmousemove="('comment',' Though the entire area of the Holy of Holies was only twenty cubits by twenty. ');"><sup>7</sup></span> Rabina said in the name of Samuel: The Cherubim [made by Solomon] stood by a miracle; for it is said, <i>And five cubits was the one wing of the Cherub,' and five cubits the other wing of the Cherub,' from the uttermost part of the one wing unto the uttermost part of the other were ten cubits</i>,<span class="x" onmousemove="('comment',' I Kings VI, 24. ');"><sup>8</sup></span> where, [then] were their bodies standing?<span class="x" onmousemove="('comment',' Since the two pairs of wings alone occupied twenty cubits, there was no room left for their bodies. (Cf. n. 12 supra.) ');"><sup>9</sup></span>