Reference for Menachot 91:2

אמר עולא בעו במערבא תנופה עושה זיקה או אינו עושה זיקה

And what creates this attachment? - It is the slaughtering.<span class="x" onmousemove="('comment',' I.e., if the loaves were in the Sanctuary at the time of the slaughtering of the lambs they at once become attached to each other, and one may not be offered without the other.');">²</span>

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