Chabad.org — English translation + Rashi
Torah Temimah points to Horayos 8a (unit 3; single primary locus per emergency Core plan).
E-Daf.com — Horayos 8a
HebrewBooks / Shas PDF
English: “Upon which they sinned” — they are not liable until they rule on a matter whose intentional violation is kares and whose inadvertent violation is chatas.
Kares/chatas threshold for communal liability — only kares-level prohibitions generate the communal bull.
The Sanhedrin’s erroneous ruling triggers the communal chatas only when the underlying prohibition is one whose intentional violation incurs kares and whose inadvertent violation incurs a private chatas. Lesser prohibitions that lack this severity do not generate the par he’elam davar of the congregation, even if the court erred concerning them.