שַׁבַּ֨ת שַׁבָּת֥וֹן הוּא֙ לָכֶ֔ם וְעִנִּיתֶ֖ם אֶת־נַפְשֹׁתֵיכֶ֑ם בְּתִשְׁעָ֤ה לַחֹ֙דֶשׁ֙ בָּעֶ֔רֶב מֵעֶ֣רֶב עַד־עֶ֔רֶב תִּשְׁבְּת֖וּ שַׁבַּתְּכֶֽם׃ (פ)
Sabbat - wielki odpoczynek to u was, i udręczać będziecie dusze wasze: dziewiątego tegoż miesiąca wieczorem; od wieczora do wieczora święcić będziecie Sabbat wasz!"
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.)