Chelek 32, Emor 1
In Parshas Emor, the Mitzvah of Shabbos is the introduction, For learning all about the Yomim Tovim. In chronological order they are written, With the first month of Nissan the list does begin. The Torah explains the Mitzvos of Pesach in the spring, Then comes the Mitzvah of bringing the Omer offering and the Omer counting. What follows is the bringing of the Two Loaves on Shavuos, Next comes Rosh Hashanah, Yom Kippur and finally Sukkos. Rabbi Yehuda Hanasi copied the order of the Torah, When he arranged the tractates in Seder Moed of the Mishnah. But the Rambam in his Mishneh Torah lists the Halachos in a different way, After the laws of Shabbos and Eiruvin, he lists resting from work on Yom Kippur day. Then he writes about the obligation, To rest from work on all the Yomim Tovim. Then comes Chametz and Matzah that we bake, Followed by Shofar, Sukkah and Lulav that we shake. For this specific order, the Maggid Mishneh explains the reason, With the laws of Shabbos the Rambam does begin...