To not do work on the tenth of Tishrei: To not do any work on Yom Kippur — and it is the tenth day of Tishrei — as it is stated (Leviticus 23:27), “on the tenth of the seventh month, etc.”; and it is written after it (Leviticus 23:28), “And you shall not do any work on that very day, since it is the day of atonements, to atone for you.” And the word, “since” (ki), [indicates] the giving of a reason for the cessation from work. And [it is] like the matter that I shall write later in this Order in the commandment of resting on Yom Kippur (Sefer HaChinukh 317). And you shall also find all of the content of this commandment there — and I will not write an addition for you about something that is not needed.
שֶׁלֹּא לַעֲשׂוֹת מְלָאכָה בַּעֲשָׂרָה בְּתִשְׁרֵי – שֶׁלֹּא לַעֲשׂוֹת שׁוּם מְלָאכָה בְּיוֹם הַכִּפּוּרִים, וְהוּא יוֹם עֲשִׂירִי לְחֹדֶשׁ תִּשְׁרֵי, שֶׁנֶּאֱמַר בֶּעָשׂוֹר לַחֹדֶשׁ הַשְּׁבִיעִי וְגוֹ' וּכְתִיב בָּתְרֵהּ וְכָל מְלָאכָה לֹא תַעֲשׂוּ בְּעֶצֶם הַיּוֹם הַזֶּה כִּי יוֹם כִּפֻּרִים הוּא לְכַפֵּר עֲלֵיכֶם. וּמִלַּת כִּי, הוּא נְתִינַת טַעַם לְבִטּוּל הַמְּלָאכָה, וּכְעִנְיָן שֶׁאֶכְתֹּב לְקַמָּן בְּסֵדֶר זֶה בְּמִצְוַת עֲשֵׂה דִּשְׁבִיתָה דְּכִפּוּרִים (מצוה שיז), וְגַם כָּל עִנְיַן מִצְוָה זוֹ שָׁם תִּמְצָאֶנּוּ, וְלֹא אֶכְתֹּב לְךָ תּוֹסֶפֶת בְּדָבָר שֶׁאֵינוֹ צָרִיךְ.
To not do work on the tenth of Tishrei: To not do any work on Yom Kippur — and it is the tenth day of Tishrei — as it is stated (Leviticus 23:27), “on the tenth of the seventh month, etc.”; and it is written after it (Leviticus 23:28), “And you shall not do any work on that very day, since it is the day of atonements, to atone for you.” And the word, “since” (ki), [indicates] the giving of a reason for the cessation from work. And [it is] like the matter that I shall write later in this Order in the commandment of resting on Yom Kippur (Sefer HaChinukh 317). And you shall also find all of the content of this commandment there — and I will not write an addition for you about something that is not needed.