Sefer HaMitzvot, Negative Commandments
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הזהיר מלגלח שער הנתק. והוא אמרו ואת הנתק לא יגלח. ולשון ספרא מנין לתולש סימני טומאה שעובר בלא תעשה תלמוד לומר ואת הנתק לא יגלח. (תזריע, הלכות טומאת צרעת פ"א):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
He prohibited shaving off the scab [of tsaraat]. And that is His saying, "but he shall not shave the scab" (Leviticus 13:33). And the language of the Sifra (Sifra, Tazria Parashat Nega'im, Chapter 9:7) is, "From where [do we know] that one who tears away signs of impurity transgresses a negative commandment? [Hence] we learn to say, 'but he shall not shave the scab.'" (See Parashat Tazria; Mishneh Torah, Defilement by Leprosy 1.)