Commentary for Avodah Zarah 70:12
אי דקא בעי לגבינה ה"נ הכא במאי עסקינן דקא בעי ליה לכמכא
If he required [the milk for the purpose of making] cheese, then this would be so; but with what are we dealing here? When he requires it for food.
Daf Shevui to Avodah Zarah
The person here does not want to test all of the milk to see if it will curdle because he wants the milk for food, not for cheese (this was probably unusual in those days). And he can’t just test a little bit, because a little bit of milk would not curdle even if it was from a clean animal. And that milk might be from an unclean animal.
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