Chabad.org — English translation + Rashi
Torah Temimah points to Kerisos 11b (unit 1; single primary locus per emergency Core plan).
E-Daf.com — Kerisos 11b
HebrewBooks / Shas PDF
English: It was taught: “Or if his sin becomes known to him” — and not that others inform him.
Self-knowledge required — the obligation arises when the sinner himself becomes aware, not merely when others tell him.
The chatas obligation is triggered by the sinner’s personal realization of the transgression. Mere report by others does not create the liability of “or if his sin becomes known to him.” Self-awareness is the decisive factor.