Sefer HaMitzvot, Negative Commandments
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הזהירנו מגרוע התורה לא מהכתוב ולא מהמקובל. והוא אמרו ולא תגרע ממנו, ובמקומות רבים אמרו עובר משום בל תגרע, עברת על בל תגרע. (ראה, שם):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
He prohibited us from subtracting from the Torah, neither from what is written nor from what is received. And that is His saying, "and do not subtract from it" (Deuteronomy 13:1). And in many places, they said, "and he transgresses on account of, do not subtract"; "you have transgressed, do not subtract." (See Parashat Re'eh; Mishneh Torah, Rebels 2.)