Sefer HaMitzvot, Positive Commandments
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היא שצונו לשבות ממלאכה באחד בתשרי. והוא אמרו יתעלה באחד לחדש יהיה לכם שבתון. וכבר קדם לנו האי שבתון עשה הוא. (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 of Tishrei. And that is His, may He be exalted, saying, "on the first day of the month, you shall have a Shabbaton"(Leviticus 23:24). And we have already [seen] that this [term], Shabbaton, is a positive commandment. (See Parashat Emor; Mishneh Torah, Rest on a Holiday 1.)