Pesahim 27a and Pesahim 27b, the question of zeh ve-zeh gorem, when two factors contribute to an item’s being made (one of them prohibited), whether the prohibited one renders the item prohibited as well, a question for various kinds of issurei hana’ah, prohibitions of benefit. Then, when and how me’ilah, use of items belonging to the Temple, takes items thus misused out of the ownership of the Temple, and then starting on why R. Yehudah thought we had to burn hametz to get rid of it on the fourteenth of Nisan.
