shabbat 36

things are different after a fire

food gets cooked
and some things switch identities

(after the destruction of the temple, various things change their names e.g. what was called a shofar is now called a trumpet, and what was a trumpet is now called a shofar. The opening mishna of the next chapter discusses about placing and leaving food on different types of fire. because fire changes things. for english translation of this talmud page is here)