Commentary for Avodah Zarah 74:3
רב אמר דכן ממש קסבר טומאת משקין דרבנן וכי גזור רבנן טומאה במשקין דעלמא אבל במשקה בי מטבחיא לא גזרו רבנן
Rav that it was actually pure: he holds that the impurity of liquids was a rabbinical ordinance and when the rabbis decreed they referred to liquids in general, but not to liquids in the slaughter house.
Daf Shevui to Avodah Zarah
Rav thinks that the notion that liquids could become impure by contact with an impure thing is only a rabbinic decree. The rabbis made this decree outside of the Temple, but not inside it. Thus these liquids are not susceptible to impurity.
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