Seeing as "Kevasim" implies two ('Miy'ut Rabim Shenayim') why does the Torah add the (otherwise superfluous) word "Sh'nei"?
Yoma, 62b: To teach us that the two lambs should be equal - in appearance, in size and in value (Torah Temimah). 1
As the word "Sh'nei always implies. Seee Torah Temmah, note 30.
Why, by the Musaf of Shabbos and of all the Yamim-Tovim, does the Torah specify the amount of the Minchah but not of the Nesech, as it does by the Korban Tamid and by the Musaf of Rosh Chodesh?
Ramban (on Pesukim 12 ? 14): Because, whereas it is not necessary to specify the Nesachim which are standard by all the Korbanos; 1 it does need to specify the Minchah by each Korban Musaf, seeing as the Minchah sometimes changes - the Minchah that accompanies the lamb of the Omer is double, and the Sh'tei ha'Lechem 2 and the bread brought with the Korban Todah are - at least partially - Chametz.
Ramban: It does however see fit to specify the Nesachim by Rosh Chodesh after having specified them by the Tamid, since the Tamid only covers the Nesachim of the lambs, but not of bulls and rams.
The Sh'tei ha'Lechem is an independent obligation. What is its relevance to Menachos brought with Zevachim? Perhaps the Ramban understands that it is the Minchah brought with the two lambs (Shalmei Tzibur) (PF)
What are the implications of "Olas Shabbas be'Shabbato"?
Rashi #1: It implies that if one did not bring the Musaf of Shabbos one week, one cannot make up for it by bringing it the following week (together with the Musaf of that week).
Rashi #2 (in Pesachim, 68b): It implies that one does not wait until nightfall (of Motza'ei Shabbos) to burn the Musafim on the Mizbe'ach, but burns it on Shabbos itself. 1
Shabbos, 114a: It implies that one burns the Olah of Shabbos on Shabbos, but not the Olah of weekday on Shabbos and not the Olah of Yom-Tov on Yom-Tov 2 - Consequently, 'Ein Sorfin Kodshim be'Yom-Tov'. 3
Shabbos, 114a: "Olas Shabbos be'Shabbos" implies that one brings the Chalavim of Shabbos on Yom-Tov (which the Torah also calls 'Shabbos'); whereas "Olas Shabbos be'Shabbato" implies only on its Shabbos, but on another Shabbos - Yom Kipur. 4
What are the connotations of the words "Al Olas ha'Tamid"?
Rashi and Targum Yonasan: It means that the Musaf is brought in addition to the Tamid shel Shachar and the Tamid shel beis ha'Arbayim, and that it must be brought in between 1 them 2 .
Pesachim, 66a: It teaches us that the Korban Tamid overrides Shabbos. 3
Why is the Korban Chatas not brought on Shabbos?
