Chapter 3, Mishna 7, 8
When do we remove chametz, leaven, from our possession if the 14th of Nissan (the day before Passover) falls on Shabbos. If one is en route to do a mitzvah and remembers he has chametz in his house on the 14th of Nissan, what should he do? Depends on the mitzvah. Apropos of optional mitzvahs and seeming mitzvahs that are actually undesirable, the Sages digress on the danger of marrying an ignoramus, and from there they go one quite a rant about the dangers of associating with ignoramuses at all. Some background is shared on the status of the ignorant in Talmudic times.