A new chapter! With several mishnayot. 1 - (from the previous daf) - If/when the anointed kohen who makes an erroneous ruling, which he then does unwittingly - he needs to bring a sin-offering in atonement. He is considered akin to the court, as it were, with regard to himself, as the court is, with regard to the public. Note the kohen's authority to determine halakhah as well. 2 - On the court's involvement (or lack thereof) in the kohen's offering, in that they really can't provide the means for his atonement. 3 - If the erroneous ruling pertains to idolatry - with a parallel to a ruling to uproat an area of the Torah - and the contingincy of being unaware of the matter altogether.