Reference for Meilah 37:28

מכדי אי בבהמה תמימה היינו כוס של זהב

Said R'Kahana to R'Zebid: Does gold indeed not deteriorate?<span class="x" onmousemove="('comment',' The general rule of the Mishnah is exemplified by a golden cup. It must, therefore, be assumed that gold is considered a material which does not deteriorate through use.');">¹⁷</span>

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