Sefer HaMitzvot, Positive Commandments
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היא שצוה להקריב קרבן בכל ראש חודש מוסף על תמיד של כל יום, וזהו מוסף ראש חדש, והוא אמרו יתעלה ויתברך שמו ובראשי חדשיכם וגו'. (פינחס, תמידין ומוספין פ"ז):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
That is that He commanded to offer a sacrifice on every Rosh Chodesh (first day of the month) in addition to the regular offering of every day. And that is His, may He be exalted and may His name be blessed, saying, "And on the beginnings of your months, etc." (Numbers 28:11). (See Parashat Pinchas; Mishneh Torah, Daily Offerings and Additional Offerings 7.)