Sefer HaMitzvot, Positive Commandments
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היא שצונו לשבות ממלאכה ביום ראשון של סוכות. והוא אמרו יתעלה ויתברך שמו ביום הראשון מקרא קדש. (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 first day of Sukkot. And that is His, may He be exalted and may His name be blessed, saying, "The first day shall be a sacred occasion" (Leviticus 23:35). (See Parashat Emor; Mishneh Torah, Rest on a Holiday 1.)