Sefer HaMitzvot, Positive Commandments
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היא שצונו להקריב קרבן מוסף ביום עשירי מתשרי. והוא אמרו יתברך ובעשור לחדש השביעי והקרבתם עולה אשה לה'. (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 tenth day of Tishrei. And that is His, may He be blessed, saying, "And on the tenth day of the seventh month [...] You shall offer a burnt-offering as a pleasing odor to the Lord" (Numbers 29:7-8). (See Parashat Pinchas; Mishneh Torah, Daily Offerings and Additional Offerings 10.)