The Gemara tells us that ‘Beis Nitza’ were conscientious people and the gezeira (of dragging a heavy bench on a stone floor) did not apply to them. Asks Rav Moshe Feinstein, we don’t seem to find that the Chachamim would differentiate between people when applying a gezeira; if so how were Beis Nitza allowed to exempt themselves from a universal gezeira?
(Although we learned earlier about exemptions for Kohanim in the Beis Hamikdash, or by the Korban Pesach, that is because the gezeira was never meant to apply to those scenarios in the first place)
The Gemara concludes that the Mishna begins with a discussion of Chazara, then proceeds to Shehiya, then concludes with a machlokes pertaining to Chazara – that Beis Shamai never allow Chazara altogether. Why does the Mishna interject with Shehiya rather than first concluding with the din of Chazara and then proceeding over to Shehiya?
The Mishna states that fuel of straw doesn’t present a concern since no coals are formed. If so how do we understand Bais Shamai who prohibit (shehiya of tavshil or chazara) even by ‘garuf’ (coals were shoveled) when there are no colas present?
We learn that according to Beis Shamai cold water is not to be poured onto hot water contained in either a Kli Rishon or Kli Sheini. Tosfos explains this is due to a concern that one may confuse the Kli Sheini with a Kli Rishon. In the following Mishna we learn that seasoning may be added to a Kli Sheini but not a Kli Rishon, and this seems agreed upon by all. Why is there no gezeira here according to Beis Shamai