Zevahim 43: Flour and Frankinscense

A new mishnah! With a list of cases that would not make a person liable for pigul. The flour of the minchah offering won't become pigul. Likewise, the frankinscense. That is, the offerings themselves may become pigul, but not the ingredients thereof. Those ingredients are what make the offering possible to begin with. Also, on the case of the consecrated food to be eaten by a person who is ritually impure - why is there a need to state both the lenient cases and the stringent cases? Either side of that "equation," as it were, should be inferrable from the other. Note that "Ze'irei" doesn't have a title of "rav" or "rabbi."