Reference for Chullin 34:38

צריכא בדיקה אבישרא ואטופרא (ואתלתא רוחתא)

that if one made a knife red-hot and slaughtered with it the slaughtering is valid, because the effect of the sharp edge precedes the effect of the heat; and the question was raised as to the sides of the knife, and the answer was given that the cut opens wide?

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