Halakhah zu Pesachim 3:10

And this is the language of the Tur: The Ittur writes that were I not afraid of other rabbis I would say that even a earthenware pot that has not been used for 24 hours since it is only a rabbinic prohibition to cook with it, can be kashered through immersion in boiling water three times and this is sufficient. And the Ittur brings proof from the Yerushalmi (Terumot 11:4). And the Rashba writes teh same thing and concludes his words by saying that perhaps this is only permissible with a rabbinic prohibition that has no basis in a Torah prohibition like Terumah or Challah outside of Israel in our times or with bishul akum (food cooked by Gentiles) but for other rabbinic prohibitions that do have a Torah basis they were strict just as with Torah prohibitions and it is appropriate to be concerns and not be lenient. All of the above is the language of the Tur. And so this leniency is entirely unmentioned in the Shulhan Arukh except for a reference in Siman 113 regarding bisul akum (food cooked by Gentiles) see there. And the Rashba in Torah haBayit discusses this at great threngh and writes that whenit comes to the strict law it appears to him that all rabbinic prohibitions should be permissible under these circumstances as the RaSh HaTzarfati writes and see there. And the Tur didn't bring the end of the Rashba's words because he was of the opinion that one should not be lenient in this way in a practical fashion. And, heaven forfend we should not violate the opinion of the Tur and Shulhan Arukh, however this is very puzzling since the Yerushalmi in Pesachim (3:1) says that when it comes to Hametz, which certainly has a foundation in Torah and the Yerushalmi there says: Rabbi Yirmiyah saidi n the name of Rav, a pot in which hametz was cooked should not be used for the same type of food until after Pesach, but a different food can be cooked in that pot even on Pesach if three items were cooked in between. And the commentator has already raised this question.