[Avodah] Sukkah on Shabbos

[aweintra at umaryland.edu]

The answer is very obvious. Micha touched on it, but it is simply yesh koach b'yad chachomim la'akor davar min hatorah b'shev v'al taaseh, not kum va'aseh. Whether it's a issur lav or bittul/issur aseh, chaza"l had no ability to instruct us to actively engage in a practice that is contrary to din torah. Period. 
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