This week's learning is sponsored by Helen Danczak. "My dear Uncle Phil passed on August 27 with family at hand. He was the kind of uncle that the kids (of all ages) gravitated to. I am not alone in saying he was my favorite uncle. He is missed. May his neshama have an aliyah."

Today's daf is sponsored by Audrey Levant in honor of Deborah Dickson. "Happy birthday to Hadran's newest wonderful addition to the team. I'm excited to start another (school) year of learning with you, my friend!"

The Mishna teaches that if the Beit Din teaches an erroneous ruling and an individual follows, the individual does not have to bring a sin offering. However, the Gemara will later explain that this is the opinion of Rabbi Yehuda, but the rabbis disagree and obligate the individual.

If the Beit Din teaches an erroneous ruling and a judge or student who has reached a stage of one who can issue halakhic rulings realizes they have made a mistake but follows their ruling anyway, he is obligated to bring a sin offering.

If the court issues an erroneous ruling and the majority of the community follow it, there is an obligation to bring a special sacrifice called 'the bull offering of an unwitting communal sin (par he'elem davar shel tzibur). Shmuel and Rav Dimi disagree about the language that must be used by the court for it to be considered "an erroneous ruling of the court." Three sources are brought to support Rav Dimi's position. In a second version of the debate, they switch positions, and the sources are raised as difficulties against Rav Dimi.

The Mishna described the actions of the individual who is exempt when sinning by following an erroneous ruling of the court using the words "shogeg al pihem, unwitting by their words." In two different versions of Rava's explanation of this term, it either refers to two different cases or to one. If it refers to two, it would include an exemption in an additional case – if the court ruled by mistake that a piece of forbidden fat was permitted, and the individual meant to eat a piece of permitted fat, but accidentally ate the piece that the court permitted. Even though Rava had an answer to that question (obligated or exempt, depending on the different versions of Rava's explanation), Rami bar Hama asked the same question and did not know the answer. Again, in two different versions, Rava answers the question by explaining the term in the Mishna. However, Rami bar Hama rejects his answer as the term is ambiguous.

The Mishna lists various ways in which the individual or a judge/student can potentially follow a ruling of the court. What is the significance of the order in each case?

How is a "teacher capable of issuing halakhic rulings" defined, and why was it necessary to include this category in addition to that of a judge?

The Gemara quotes two braitot, one explaining the source for Rabbi Yehuda's position in the Mishna, exempting an individual who follows the court, and the other explaining the source for the rabbis' dissenting opinion obligating an individual who follows the court. The latter braita is complicated to understand, and the Gemara irons out its meaning and shows how it reflects the rabbis' position.