Commentary for Shabbat 104:9
במתניתא תני במחוללין
Shall we say that R. Ammi holds as R. Joseph? For if as R. Isaac, who maintained that it refers to such as pass from [being] men's ornaments to [become] animals' ornaments; since he beat them out, he has performed an act, and their uncleanness vanishes. For we learnt: All utensils enter upon their uncleanness by intention, but are relieved from their uncleanness only by a change-effecting act!<span class="x" onmousemove="('comment',' Utensils become unclean only from when they are quite finished for use; if they still require smoothing, scraping, etc., they are not liable to uncleanness, unless their owner declares his intention to use them as they are. On the other hand, having done so, it is not enough that he subsequently declares that he will not use them, in order to relieve them from their susceptibility to defilement, unless he actually begins smoothing them. Or, if the utensils are unclean, it is insufficient for their owner to state that he will not use them any more, so that they should lose the status of utensils and become clean, but must render them unfit for use by an act, e.g., break or make a hole in them. ');"><sup>8</sup></span>
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