Chabad.org — English translation + Rashi
Torah Temimah points to Horayos 8a.
E-Daf.com — Horayos 8a
HebrewBooks / Shas PDF
English: “Which shall not be done” — excluding a positive commandment.
Miyut of aseh from chatas — chatas is brought for violation of a negative commandment, not for failure to perform a positive commandment.
Chatas is brought for violation of a negative commandment, not for failure to perform a positive commandment. The phrase “which shall not be done” is read as restricting the chatas of chapter 4 to lavin. An omitted positive commandment does not, by itself, generate this offering.