Sefer HaMitzvot, Negative Commandments
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הזהיר מעשות מלאכה ביום ראשון של פסח. והוא אמרו כל מלאכה לא יעשה. (בא אל פרעה, זמנים הלכות שביתת יום טוב פ"א):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
He prohibited doing work on the the first day of Pesach. And that is His saying, "no work shall be done" (Exodus 12:16). (See Parashat Bo; Mishneh Torah, Rest on a Holiday 1.)