Sefer HaMitzvot, Negative Commandments
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הזהירנו מהוסיף בתורה לא בכתוב ולא במקובל, והוא אמרו לא תוסיף עליו, ובבאור אמרו במקומות רבים ועובר משום בל תוסיף, עברת על בל תוסיף. (ראה, הלכות ממרים פ"ב):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
He prohibited us from adding to the Torah, both to what is written and to what is received. And that is His saying, "do not add to it" (Deuteronomy 13:1). And in the explanation, they said in many places, "and he transgresses on account of, do not add"; "you have transgressed, do not add." (See Parashat Re'eh; Mishneh Torah, Rebels 2.)