Reference for Chullin 48:33

(ויקרא כא, יז) איש מזרעך לדורותם מכאן אמר רבי אלעזר

It follows, therefore, that that which cannot be rendered unclean in earthenware vessels can be rendered unclean in all other vessels, and that which cannot be rendered unclean in all other vessels can be rendered unclean in earthenware vessels.

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