Chabad.org — English translation + Rashi
Torah Temimah points to Horayos 5a (unit 1; single primary locus per emergency Core plan).
E-Daf.com — Horayos 5a
HebrewBooks / Shas PDF
English: It was taught: If the assembly knew that the beit din had ruled and erred in what they ruled — might they be liable? The verse says “and the sin becomes known” — and not that the sinners know.
Knowledge of the sin itself required — communal liability requires that the actual sin become known, not merely awareness that the court erred.
The trigger for the communal chatas is the revelation of the particular transgression (“ve-nod’ah ha-chatat”), not the mere discovery that the Sanhedrin issued an erroneous ruling. If the people know only that the court was wrong, without knowing which concrete act constitutes the sin, the offering is not yet obligatory. Knowledge must reach the level of the specific chatat.