Finishing the 4th chapter – with the series of baraitot about the “chaver” – with a focus here on the last one. That is, specifically, a kohen can examine first-borns for blemishes, as long as they are not being given to himself, but he could rule on his own sacrifices, for example. Plus, how many judges are needed for various things, including judging first-borns, one or three? Plus, other examples that require a court of 3, including halitzah. What if you have an expert in blemishes on that court? And starting chapter 5 – with a new mishnah: selling the meat of disqualified consecrated animals at the butcher vs. selling the blemished of first-born animals. They’re not weighed precisely in contrast to the regular consecrated animals, and the proceeds go to the owner. Plus, Rav Sheshet and narrowing the focus of the mishnah to orphans…