Chabad.org — English translation + Rashi
Torah Temimah points to Horayos 10b (unit 1; single primary locus per emergency Core plan).
E-Daf.com — Horayos 10b
HebrewBooks / Shas PDF
English: Rabbi Yochanan ben Zakkai said: Fortunate is the generation whose nasi brings an offering for his inadvertent sin.
Praise of a generation with accountable leadership — a nasi who acknowledges and atones for shegagah is a mark of a blessed generation.
Rabbi Yochanan ben Zakkai praises the generation whose nasi brings a chatas for his own inadvertent sin. The willingness of the highest political authority to submit to the same atonement process as any private individual is itself a measure of the generation’s spiritual health.