Horayot 4: Only a Child Could Make Such an Error (with all due respect to children!)

An indictment of the Sadducees in the context of a court that issues an erroneous ruling that agrees with their understanding of the Torah. With a further investigation into what it would mean to make this kind of "uprooting halakhah" kind of error - how did that come about? And - two new mishnayot: 1 - Ways in which the erroneous judgement came to be issued when it so clearly should not have been. Plus, capital punishment. 2 - What if everyone sins because of the erroneous judgement? That's when the sacrifice or offering becomes essential, for each person.