Reference for Chullin 257:16

אמר אביי הרי אמרו

For it now serves as wood.<span class="x" onmousemove="('comment',' When converted into a seat it has lost all the characteristics of a foodstuff and has become quite a new article, and as such can convey the graver uncleanness. Accordingly the uncleanness spoken of can well be by the law of the Torah. ,cure,');">¹⁰</span>

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