Pesahim 76a and Pesahim 76b, when one item of a mixture is hot, how we decide if the taste from a prohibited item will transfer to the permitted one–whether ila’ah gevar, the one being introduced to the mixture defines the interaction, or teta’ah, the lower one. Then, whether smell counts to transfer taste, along with the reason to not roast two Pesah sacrifices together, and then a new Mishnah about communal sacrifices offered but not eaten despite the community’s being ritually impure.
