בַּיּ֥וֹם הָרִאשׁ֖וֹן מִקְרָא־קֹ֑דֶשׁ כָּל־מְלֶ֥אכֶת עֲבֹדָ֖ה לֹ֥א תַעֲשֽׂוּ׃
Sa unang araw ay magkakaroon ng isang banal na pagtitipon; huwag kayong gagawa ng anumang mabigat na gawain.
Mishneh Torah, Positive Mitzvot
To rest on the first day of the Feast of Tabernacles, as it is said, “On the first day there shall be a holy convocation; (ye shall do no servile work therein)” (Lev. 23:35).
Sefer HaChinukh
The commandment of resting on the first day of the holiday of Sukkot: To rest from any work which is not for the needs of food for the soul on the first day of the holiday of Sukkot, as it is stated (Leviticus 23:35), “On the first day, a holy occasion.”
Mishneh Torah, Negative Mitzvot
Not to do work on the first day of the Feast (of Tabernacles), as it is said concerning it, “Ye shall do no servile work” (ibid. 23:35).