This week the Gemara finishes the discussion of bird offerings: which incorrect performance or placement makes them invalid, how that affects the laws of misuse of sacred property and ritual impurity from eating. We will also examine invalid bird slaughter performed in the Temple. Finally, the tractate begins a new chapter about mixtures: what happens when valid offerings become mixed with forbidden animals, which items can never be nullified in a mixture, and how the prohibition of benefit influences the entire mixture.
