Reference for Pesachim 218:2

אמר רב אשי אמר לי רבין בר חיננא שולחן של מקדש של פרקים הוה דאי ס"ד הדוקי הוה מיהדק אמתא באמתא היכי מטבליה

For if you should think that it was [permanently] fastened, how could one immerse a cubit in a cubit?<span class="x" onmousemove="('comment',' The Table was a cubit square, while a mikweh, as stated here, was likewise a cubit square; hence it would be impossible to immerse the Table in the mikweh if it became unclean and needed a ritual bath.');">³</span> What difficulty is this! Perhaps it was immersed in the sea which Solomon made.

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