Sefer HaMitzvot, Positive Commandments
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היא שצוה להקריב קרבן מוסף גם כן ביום חמשים מהקרבתם העומר שהוא ששה עשר בניסן, וזהו מוסף עצרת הנזכר בספר במדבר סיני. והוא אמרו יתעלה וביום הבכורים בהקריבכם. (פינחס, תמידין ומוספין פרק ח'):
That is that He commanded to also offer an additional sacrifice on the fiftieth day from the offering of the omer, [the latter being on] the 16th of Nissan. And that is the additional sacrifice of Atzeret (Shavuot) mentioned in the Book of Numbers. And that is His, may He be exalted, saying, "On the day of the first fruits, when you offer" (Numbers 28:26). (See Parashat Pinchas; Mishneh Torah, Daily Offerings and Additional Offerings 8)