שִׁבְעַ֣ת יָמִ֔ים תַּקְרִ֥יבוּ אִשֶּׁ֖ה לַיהוָ֑ה בַּיּ֣וֹם הַשְּׁמִינִ֡י מִקְרָא־קֹדֶשׁ֩ יִהְיֶ֨ה לָכֶ֜ם וְהִקְרַבְתֶּ֨ם אִשֶּׁ֤ה לַֽיהוָה֙ עֲצֶ֣רֶת הִ֔וא כָּל־מְלֶ֥אכֶת עֲבֹדָ֖ה לֹ֥א תַעֲשֽׂוּ׃
七日之內，你們要將火祭獻給永恆者；第八日，你們要有聖會，要將火祭獻給永恆者。這是留下來聚會的日子；任何勞役的工作你們都不可做。
Mishneh Torah, Rest
These six days on which Scripture prohibited labor—being the first and seventh days of Passover, the first and eighth days of Sukkot, the day of Shavuot and the first day of the seventh month (Rosh Hashanah)—are called holidays (yamim tovim). The [degree of] cessation of work is equal in all of them, in that all work is prohibited except for labor that is for the sake of eating—as it is stated (Exodus 12:16), "only anything that is eaten by any person."
Mishneh Torah, Positive Mitzvot
To offer up an additional sacrifice on the Feast of Tabernacles, as it is said, “…. and ye shall offer a burnt-offering, a sacrifice made by fire of sweet savour” (Num. 29:12-34).