Chabad.org — English translation + Rashi
Torah Temimah points to Horayos 8a (unit 8; single primary locus per emergency Core plan).
E-Daf.com — Horayos 8a
HebrewBooks / Shas PDF
English: One who would repent from knowledge brings an offering for his shegagah; one who would not repent from knowledge does not bring an offering for his shegagah.
Miyut of the unrepentant mumar — a mumar who would not repent even if informed is excluded from bringing chatas.
Only a person who would abandon the sin upon being informed of its prohibition is obligated to bring a chatas for shegagah. One who is a mumar and would continue the act even after knowledge is excluded from the offering, because the entire institution of shegagah assumes a baseline willingness to return.