Halakhah su Levitico 22:7

The commandment of resting on the first day of Pesach: To rest on the first day of Pesach, as it states about it (Leviticus 22:7), "On the first day, a holy occasion." And about all about which it is stated in the Torah, "a holy occasion," they, may their memory be blessed, explained (Sifra, Emor, Chapter 12:4), "Make it holy." And the content of its holiness is that no work be done on it, except for that which is specific to eating; as the verse elucidated (Exodus 12:16), "but that which is eaten by every soul, that alone shall be done for you." And the proof that the rest of the holiday is considered a positive commandment is their, may their memory be blessed, saying (Shabbat 25a), "This 'shabbaton' is a positive commandment." And we learn from now that in every place that shabbaton is stated in the Torah with regards to a holiday, it is a positive commandment. And [what] also appears much in the Talmud is, "The holiday is a positive commandment and a negative commandment."

To not do work on the first day of Pesach: That we not do work on the first day of the holiday of Pesach - which is the fifteenth of Nissan - as it is stated (Leviticus 23:7), "On the first day, a holy occasion shall it be for you; all work of labor shall you not do." And Scripture already warned about this in the Order of Bo el Pharoah in the command of the holiday of Pesach; as it is stated there (Exodus 12:16), "all work shall not be done upon them." And Rambam, may his memory be blessed, brought that verse (in Sefer HaMitzvot LaRambam, Mitzvot Lo Taase 223) in his tally. But I have written this other one, so that the holidays be organized in one order. But it all comes to the same thing.