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Today’s Daf Yomi Question:
The Gemara asks that the Passuk was already applied to determine the size of a Karfef (and is thus unavailable for the rope size). Tosfos (23b) points to this Gemara as an indication that the Karfef size is a din Torah (otherwise one would be able to derive two hints from the same Pssuk). How is the din of Karfef – which seems to be a Derabanan concept – have a Torah application?
After the Mishna, the Gemara asks how do we know to add a Karfef. The Gemara says that we learn this from Vechutza La. This Passuk is by the cities of the Leviim. That would mean that the Shiur of a Karfef is a Deoraysa concept since it is necessary for the Leviim.