Menahot 6: Mishnah vs. Amora

More on learning the details of the treyfa from "min ha-bakar" - to disqualify the treyfa. How several verses work together to learn the teaching that the Gemara wants to prove. Plus, a new mishnah! With a list of ways the offering would be rendered invalid. Also, a statement from Rav that seems to contradict the statement that a non-kohen taking the fistful of the grain would render it invalid. Can this error simply be redone? That may depend on the details of the case.