Leviticus 23:33-36

דַּבֵּ֛ר אֶל־בְּנֵ֥י יִשְׂרָאֵ֖ל לֵאמֹ֑ר בַּחֲמִשָּׁ֨ה עָשָׂ֜ר י֗וֹם לַחֹ֤דֶשׁ הַשְּׁבִיעִי֙ הַזֶּ֔ה חַ֧ג הַסֻּכּ֛וֹת שִׁבְעַ֥ת יָמִ֖ים לַיהֹוָֽה׃

Say to the Israelite people: On the fifteenth day of this seventh month there shall be the Feast of Booths to יהוה, [to last] seven days.

בַּיּ֥וֹם הָרִאשׁ֖וֹן מִקְרָא־קֹ֑דֶשׁ כׇּל־מְלֶ֥אכֶת עֲבֹדָ֖ה לֹ֥א תַעֲשֽׂוּ׃

The first day shall be a sacred occasion: you shall not work at your occupations;

שִׁבְעַ֣ת יָמִ֔ים תַּקְרִ֥יבוּ אִשֶּׁ֖ה לַיהֹוָ֑ה בַּיּ֣וֹם הַשְּׁמִינִ֡י מִקְרָא־קֹ֩דֶשׁ֩ יִהְיֶ֨ה לָכֶ֜ם וְהִקְרַבְתֶּ֨ם אִשֶּׁ֤ה לַֽיהֹוָה֙ עֲצֶ֣רֶת הִ֔וא כׇּל־מְלֶ֥אכֶת עֲבֹדָ֖ה לֹ֥א תַעֲשֽׂוּ׃

seven days you shall bring offerings by fire to יהוה. On the eighth day you shall observe a sacred occasion and bring an offering by fire to יהוה; it is a solemn gathering: you shall not work at your occupations.

Numbers 29:35

בַּיּוֹם֙ הַשְּׁמִינִ֔י עֲצֶ֖רֶת תִּהְיֶ֣ה לָכֶ֑ם כׇּל־מְלֶ֥אכֶת עֲבֹדָ֖ה לֹ֥א תַעֲשֽׂוּ׃

On the eighth day you shall hold a solemn gathering; you shall not work at your occupations.

RASHI: You shall not work: you are restricted in the doing of work. Another explanation of עצרת: Restrict yourselves from leaving Jerusalem: this teaches that this (the eighth day) requires that they should remain in Jerusalem overnight (that the pilgrims should not immediately at the termination of the seventh day begin their homeward journey)

What is work, to YOU?

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Mishneh Torah, Rest on a Holiday 1:1

The six days on which the Torah forbade work are the first and seventh days of Pesach, the first and eighth days of the festival of Sukkot, the festival of Shavuot, and the first day of the seventh month. They are referred to as holidays.
The [obligation to] rest is the same on all these days; it is forbidden to perform all types of servile labor, with the exception of those labors necessary for [the preparation of] food, as [implied by Exodus 12:16]: "Only that [labor] from which all souls will eat [may you perform]."

Shabbat 133a:13

Rav Ashi said: The mitzvot of a Festival include not only a negative mitzva but also a positive one. There is a prohibition of labor as well as Shabbaton, an obligation to engage in solemn rest, which is a positive mitzva, and therefore the observance of a Festival constitutes both a positive mitzva and a negative mitzva. And there is a principle that a positive mitzva does not override both a negative mitzva and a positive mitzva.

מִקְרָא־קֹֽדֶשׁ – MIKRAH KODESH- convocation

Mikrah – read/named/called/call – exclamation/announcer

Kodesh – Sanctify/hallow/ separate-apart/devote/Temple/Sanctuary

מְלֶ֥אכֶת – melekhet - work/labor/crafts

Mishneh Torah, Sabbath 1:1

Resting from labor on the seventh day fulfills a positive commandment, as [Exodus 23:12] states, "And you shall rest on the seventh day." Anyone who performs a labor on this day negates the observance of a positive commandment and also transgresses a negative commandment, for [ibid. 20:10] states, "Do not perform any labor [on it]."