Sefer HaMitzvot, Positive Commandments
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היא שצונו לשבות ממלאכה בשביעי של פסח והוא אמרו יתעלה ביום השביעי מקרא קדש. (אמור אל הכהנים, זמנים הלכות שביתת יו"ט פ"א):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
That is that He commanded us to rest from work on the seventh [day] of Pesach. And that is His, may He be exalted, saying, "a sacred occasion on the seventh day" (Exodus 12:16). (See Parashat Emor; Mishneh Torah, Rest on a Holiday 1.)