Reference for Temurah 17:59

תניא כוותיה דרבי יוחנן תניא כוותיה דר"ל

that one can effect an exchange with one [hullin] for two [consecrated animals] and with two [hullin] for one [consecrated animal]; with one [hullin] for a hundred [consecrated animals] and with a hundred [hullin] for one [consecrated animal].

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