They say nobody argues in this chapter. Is that true?
The siddur prints a short note before this chapter (you passed it in part 1). It says the chapter was chosen because there is no dispute anywhere in it. The note comes from the Beit Yosef (Rabbi Yosef Karo's 1500s commentary on the Tur, an earlier law code), who quotes the Ra'ah (Rabbi Aharon HaLevi of Barcelona, 1200s). Read the whole chapter and it holds up. Not once does it say "Rabbi So-and-so says."
Now look at the last line: the Pesach offering is eaten "only until midnight." The Gemara (the discussions of the Sages built around the Mishnah) asks who taught this. Rav Yosef answers: Rabbi Elazar ben Azaryah. He noticed that the Torah says "on this night" twice, once about eating the offering and once about the plague of the firstborn. Just as there it means until midnight, so here.
Rabbi Akiva disagreed. The Torah also says to eat it "in haste," and he read that as the haste of Israel, who left Egypt by day. So by Torah law there is time until morning.
Abaye pushed back on Rav Yosef. Maybe our line fits Rabbi Akiva too, and midnight is only a safety margin, the way it is for the other one-day offerings in this chapter. The reply turns on one word. For the thanksgiving offering the chapter says "until midnight." For the Pesach it says "only until midnight."
So is the claim wrong? Part 1 mentioned the answer of the Kaf HaChaim (a Sephardic law commentary, early 1900s): no dispute is mentioned inside the chapter. Some of its laws are disputed elsewhere, and his example is this line.
The question never fully closed. The Rambam rules that midnight is a safeguard and the Torah's deadline is dawn. The Mishnah Berurah (a commentary on daily law, around 1900) reports that the early authorities were left in doubt about someone who ate the Seder matzah after midnight. Either way, this rule is the reason the afikoman, the matzah eaten at the end of the Seder meal in memory of the Pesach offering, is eaten before midnight.
Beit Yosef, Orach Chaim 50,Zevachim 57b, with Rashi,Berakhot 9a,Mishnah Berakhot 1:1,Kaf HaChaim, Orach Chaim 50:1,Rambam, Laws of the Pesach Offering 8:15,Shulchan Aruch, Orach Chaim 477:1, with Mishnah Berurah 477:6A guilt offering for something I might not have done?
The last guilt offering on the list is the strangest. Its name, asham talui, means a guilt offering that is "hanging." The Torah describes a person who sinned "and did not know." Bartenura (the standard Mishnah commentary, around 1500) explains: maybe he did something serious by mistake, and maybe he did not. The standard example: two pieces of fat were in front of him, one permitted and one forbidden. He ate one and cannot tell which.
For a mistake he is sure about, he brings a sin offering. For a maybe, the Torah asks for a ram. The Rema (Rabbi Moshe Isserles, whose notes on the Shulchan Aruch, the main code of Jewish law, add Ashkenazi practice) points out that it had to cost more than a sin offering. Why would "maybe" cost more than "definitely"?
The Rema gives the reason, and the note printed with his words points to Rabbeinu Yonah (a Spanish rabbi of the 1200s) for the same idea: "A doubtful sin needs more repentance than a definite one, because a person regrets more when he knows he did it than when he does not know." When you are sure, it bothers you. When you are not sure, it is easy to let yourself off.
Some people took this far. In the Mishnah, Rabbi Eliezer says a person may bring this offering any day he wants, and it was called "the guilt offering of the pious." Bava ben Buta brought one every day except the day after Yom Kippur. He swore he would have brought one then too. But they told him: wait until you could be in doubt.
The Sages disagreed with Rabbi Eliezer: it is brought only for a doubt about a sin serious enough to need a sin offering. The Magen Avraham (a 1600s commentary on the Shulchan Aruch) writes that the law follows them, and advises adding an "if" to the request after the Torah's guilt offering passage. The siddur does the same here. The next two requests say only "as if I brought." This one begins "if I owe a guilt offering."
Vayikra 5:17-18,Bartenura on Mishnah Zevachim 5:5,Rema, Orach Chaim 603:1,Mishnah Keritot 6:3,Magen Avraham 1:11Why does a thank-you offering come with a deadline?
Compare two lines. A regular peace offering can be eaten for two days and a night. The thanksgiving offering is a kind of peace offering, but it gets one day and one night, and the Sages stopped the night at midnight. It also comes with bread. A lot of bread: four kinds, ten loaves of each.
Who brought one? Rashi (11th-century France, the most widely read Torah commentator) gives examples: someone who crossed the sea, crossed a desert, got out of prison, or recovered from an illness. The list comes from Tehillim 107, and the Gemara states it as a rule: these four must give thanks.
So picture it. One person, a whole animal, forty loaves (four of them go to the kohen, the priest), and less than a day before the leftovers are forbidden. Nobody finishes that alone.
The Netziv (Rabbi Naftali Tzvi Yehuda Berlin, who led the Volozhin yeshiva in the 1800s) says that is the design. The Torah gave this offering more bread and less time so that the person would invite many friends to one meal on that day, and the story of what happened would be told in front of a lot of people. Sforno (an Italian Torah commentator of the 1500s) says the same about the bread: with so much of it, the miracle becomes known to many eaters.
The idea outlived the Temple. In the Gemara, Abaye says this thanks has to be said in front of ten people. That is the blessing called HaGomel, which someone says in shul after coming through danger. The Rosh (Rabbeinu Asher, a leading authority who died in 1327) writes that the blessing was set up in place of the thanksgiving offering.
Vayikra 7:12-16, with Rashi,Mishnah Zevachim 5:6-7,Berakhot 54b,Netziv, Ha'amek Davar on Vayikra 7:13,Sforno on Vayikra 7:11,Rosh, Berakhot 9:3