Musar for Avodah Zarah 77:12

והקורט של חילתית: מ"ט משום דמפסקי ליה בסכינא אע"ג דאמר מר נותן טעם לפגם מותר אגב חורפיה דחילתיתא מחליא ליה שמנוניתא והוה ליה כנותן טעם לשבח ואסור

A sliver of hiltit [may not be eaten]. What is the reason? Because they cut it with a knife [on which there is residue from a non-kosher substance]; And although a master has said that when [the forbidden element] imparts a worsening flavor [the mixture] is permitted, the sharpness of the hiltit sweetens the fatty substance [which had been absorbed in the knife] and it therefore becomes a case where [the forbidden element] imparts an improved flavor and as such is prohibited.

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