Finishing the 4th chapter, with a new mishnah: A sacrifice is slaughtered for the sake of 6 things -- all of which are far less tangible than the animal itself. The kohen's intentions have been preoccupying the Gemara for all these chapters, but now the shift, at the very end, is to the owner's intentions - that is, those of the person offering the sacrifice, even though it's handled professionally, as it were, via the kohanim. Also, starting the 5th chapter, with a new mishnah: The worship of certain sacrifices, from slaughter to collecting of blood to sprinkling of blood, needs to be specifically located in the Temple - in the northern part of the courtyard. To the extent that failing to do so correctly disqualifies the offering. But if the disposal of the blood is not as prescribed, it won't disqualify the offering. Specifically, the bull and the goat of Yom Kippur. Plus, what seems to be the carcasses would be removed to the ash pile outside of the Temple.