Reference for Chullin 48:39
רבי אית ליה פסול מדרבנן והא רבנן היא ולכתחלה הוא דלא אבל דיעבד עבודתו כשרה:
But whence do we know this in the former case? - R'Jonathan said: The Torah has declared the contents of an earthenware vessel [to be unclean]
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