Sefer HaMitzvot, Positive Commandments
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היא שצונו לשבות ביום הכפורים מהמלאכות והמעשים. והוא אמרו יתעלה שבת שבתון הוא לכם. וכבר בארנו פעמים אמרם האי שבת עשה הוא. (אמור אל הכהנים, זמנים הלכות שביתת יו"ט פ"א):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
And that is that He commanded us to rest from work and [certain] actions on Yom Kippur. And that is His, may He be exalted, saying, "It is a Shabbat of Shabbaton for you" (Leviticus 16:31). And we have already explained several times that this rest is a positive commandment. (See Parashat Emor; Mishneh Torah, Rest on a Holiday 1.)