Reference for Chullin 65:24

ידים שניות הן ואין שני עושה שלישי בחולין

Are not [unwashed] hands unclean in the second degree and that which is unclean in the second degree cannot render 'common' food unclean in the third degree? - But whence do you gather that we are dealing with common food? - For it reads [in the Mishnah].

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