Chabad.org — English translation + Rashi
Torah Temimah points to Kerisos 19a (unit 2; single primary locus per emergency Core plan).
E-Daf.com — Kerisos 19a
HebrewBooks / Shas PDF
English: “In which he sinned” — until it becomes known to him in what he sinned.
Specific identification of the sin — he must know the particular prohibition he violated, not merely that he did something wrong in general.
Vague awareness that “something was wrong” is insufficient. The sinner must know the specific mitzvah or prohibition he transgressed before the chatas obligation is fully triggered. The verse’s language “in which he sinned” demands that level of particularity.