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
Shabbos 42 – שבת מב
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