Sefer HaMitzvot, Positive Commandments
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היא שצוה להקריב קרבן מוסף בחג הסכות, והוא אמרו יתעלה והקרבתם עולה, וזהו מוסף החג. (פינחס, תמידין ומוספין פ"י):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
That is that He commanded to offer an additional sacrifice on the holiday of Sukkot. And that is His, may He be exalted, saying, "You shall offer a burnt-offering" (Numbers 29:13). And that is the additional offering of the holiday. (See Parashat Pinchas; Mishneh Torah, Daily Offerings and Additional Offerings 10:3.)