שַׁבַּ֨ת שַׁבָּת֥וֹן הוּא֙ לָכֶ֔ם וְעִנִּיתֶ֖ם אֶת־נַפְשֹׁתֵיכֶ֑ם בְּתִשְׁעָ֤ה לַחֹ֙דֶשׁ֙ בָּעֶ֔רֶב מֵעֶ֣רֶב עַד־עֶ֔רֶב תִּשְׁבְּת֖וּ שַׁבַּתְּכֶֽם׃ (פ)
這是你們完全安息的安息日，你們要刻苦自己；從這月初九的晚上起，從晚上到晚上，你們要守你們的安息。
Sefer HaMitzvot
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.)