Sefer HaMitzvot, Positive Commandments
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היא שצונו לשבות ממלאכה ביום עצרת. והוא אמרו יתברך וקראתם בעצם היום וגו'. (אמור אל הכהנים, זמנים הלכות שביתת יו"ט פ"א):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
That is that He commanded us to rest from work on the day of Atzeret (Shavuot). And that is His, may He be blessed, saying, "On that same day you shall call, etc." (Leviticus 23:21). (See Parashat Emor; Mishneh Torah, Rest on a Holiday 1.)