Reference for Shabbat 115:14

והא תניא כלי אבנים כלי גללים וכלי אדמה אין מקבלין טומאה לא מדברי תורה ולא מדברי סופרים אלא ש"מ של מתכת ש"מ:

one [a slave] may not go out with it; that about which the master is not particular, one may go out with it. Reason too supports this, since it is stated: 'none of these are susceptible to defilement'. Now, if you say [that the reference is to] metal [seals], it is well; [hence] only these are not susceptible to defilement, but their utensils<span class="x" onmousemove="('comment',' I.e., the general appointments of an animal, its accoutrement and equipment, which rank as utensils. ');">¹⁴</span>

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