The 68th mitzvah is that the High Court is commanded to bring an offering if they inadvertently erred in a legal ruling.1

The source of this commandment is G‑d's statement2 (exalted be He), "If the entire community of Israel commits an inadvertent violation as a result of [the truth] being hidden from the eyes of the congregation3 [....the congregation must bring a young bull as a sin-offering]."

The details and all the conditions governing this mitzvah are fully explained in tractate Horayos and in a number of passages in tractate Zevachim.4