Sefer HaMitzvot, Negative Commandments
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הזהיר מעשות מלאכה ביום ראש השנה. והוא אמרו כל מלאכת עבודה לא תעשו. (שם, שם):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
He prohibited doing work on the day of Rosh Hashanah. And that is His saying, "you shall not do any work of labor" (Leviticus 23:25). (See Parashat Emor; Mishneh Torah, Rest on a Holiday 1.)