Gemara

Question: (In Chutz la'Aretz,) we keep two days of Yom Tov (so there are only five days of Chol ha'Mo'ed Sukos). Which Korbanos do we say? (A different Korban is brought each day. Each day is a Safek; if Elul was 30 days, each day is really one less than our count.)

Answer #1 (Abaye): We omit the second day (the first two days of Yom Tov we say the Korbanos of day one. On days three through seven of Sukos we say the Korban for that day);

Answer #2 (Rava): We omit the seventh day (each day of our Chol ha'Mo'ed we say the Korban for the corresponding day of Chol ha'Mo'ed mid'Oraisa. Therefore, we never say the Korban for the sixth day of Chol ha'Mo'ed mid'Oraisa.)

Support (for Rava - Beraisa): If Shabbos falls on a day of Chol ha'Mo'ed, (the next day we resume saying the Shiros for Chol ha'Mo'ed, in order, so) Yimoto (the Shir for the last day of Chol ha'Mo'ed, i.e. when no day of Chol ha'Mo'ed is Shabbos) is omitted.

Ameimar enacted in Neharda'a to repeat (this will be explained).

Rosh Hashanah 35a - Question: R. Meir says that the Shali'ach Tzibur is Motzi the Rabim in the Berachos of (Shemoneh Esre only on) Rosh Hashanah and Yom Kipur (of Yovel). Why are they different?

Suggestion: There are many verses.

Rejection: Rav taught that after saying 'And it is written in Your Torah', he need not say anything else!

Rishonim

Rif and Rosh (Megilah 10b and 4:10): Ameimar enacted in Neharda'a to repeat in Kri'as ha'Torah. A Gaon explained that on the first two days we read only "Uva'Chamishah Asar".

Rosh (ibid.): On Yom Tov we do not mention the Korban of a Yom Chol, lest people disgrace Yom Tov.

Rif (ibid.), Rambam (Hilchos Tefilah 13:13) and Rosh (ibid.): On the third day, which is Chol ha'Mo'ed, the Kohen reads "Uva'Yom ha'Sheni..." (the Parashah of Korban Musaf for day two). The Levi and Yisrael both read "Uva'Yom ha'Shelishi...", and the fourth reads the Parashiyos for days two and three. On the fourth day, the Kohen reads the Parashah for day three, the Levi and Yisrael both read for day four, and the fourth reads for days three and four. We read like this every day until the seventh day.

R. Chananel (DH Anan): The Amora'im discuss Kri'as ha'Torah and Tefilah.

Rashi (DH Anan and DH Iskin): The Amora'im discuss which Korbanos we mention in Musaf. Ameimar says that we read the Sefekos of the day; each day we repeat (part of) what was said the previous day. The same applies to Kri'as ha'Torah. The fourth Aliyah is extra to honor Chol ha'Mo'ed, so he reads the Sefekos of the day. We are not so concerned for what the first three read. My Rebbi'im's custom was for the first two to read the Sefekos, and the third would read the following day.

Rebuttal (Tosfos DH Iskin): If so, we must do differently on the seventh day, for it is not appropriate to read Korbanos (of Shemini Atzeres) not appropriate to the Chag! Also, on Chanukah the first two read the Nasi for that day. This shows that the first Aliyos are primary! Rather, the first two read the Sefekos (one each), and also the last two.

Defense (Maharsha): (Rashi and) Tosfos himself explained that on Chol ha'Mo'ed the last reading is primary because it is extra to honor the day!

Rosh (Rosh Hashanah 4:14): Rashi explains that the 'many verses' in the Berachos of Rosh Hashanah and Yom Kipur are the Korbanos of Musaf. Rav teaches that they are not Me'akev. R. Tam explains that the verses of Malchuyos, Zichronos and Shofaros are not Me'akev, but those of Korbanos Musaf are. Many disagree with R. Tam. If Malchuyos, Zichronos and Shofaros, which are explicitly taught in the Mishnah are not Me'akev, all the more so the verses of Korbanos Musaf, which are not mentioned in the Mishnah or Gemara are not Me'akev! In Sefard the custom is to say them only on Shabbos and Rosh Chodesh. Since these are frequent, people will not err.

Poskim

Shulchan Aruch (663:1): On Chol ha'Mo'ed Sukos four people read the Korbanos of Sukos. In Chutz la'Aretz on the first day of Chol ha'Mo'ed the Kohen reads "Uva'Yom ha'Sheni", the Levi and Yisrael read "Uva'Yom ha'Sheni", and the fourth reads the Sefekos (days two and three). We read like this every day.

Rema: Some say that the first two read the Sefekos (one each), the third reads the day after that, and the fourth reads the Sefekos. This is our custom.

Beis Yosef (DH u'Mah she'Chosav): This is like Rashi. Tosfos says that the first two read the Sefekos, and also the last two. Some texts of the Rambam are like Rashi; others are like the Rif and Rosh. The latter is the primary opinion.

Rema: On the seventh day the Kohen, Levi and Yisrael read for days five, six and seven, respectively. The fourth reads for days six and seven.

Mishnah Berurah (137:11): If the Maftir omitted part of the Kri'ah, he reads it afterwards. He blesses again only if he omitted an essential part of Chovas ha'Yom. E.g. if the first day of Chol ha'Mo'ed Sukos is on Shabbos, he should say for days two and three. Since the calendar is fixed and it is really the third day, he blesses again only if he omitted part of that Parashah.

Shulchan Aruch: In Eretz Yisrael there is no Safek. Every day the Kohen reads the Korban for that day, and the next three read the same.

Rema (488:3): On every Yom Tov our custom is to say in Musaf the verses of Korban Musaf for that day.

Kaf ha'Chayim (39): The custom of Sefardim is not to say them.

Mishnah Berurah (13): If one did not mention the Korban he was Yotzei. If he mentioned a Korban not appropriate for the day, if he did not finish the Berachah he should begin again from the beginning of the Korbanos. If he finished the Berachah, he need not go back.

Mishnah Berurah (663:6): Similarly, in Tefilas Musaf of Chol ha'Mo'ed Sukos we say the Korbanos of Sefekos ha'Yom. One should say "U'Minchasam..." after the Korbanos for each day.