Mishneh Torah — Positive Mitzvot מצוות עשה, Chapter 68
The full Hebrew text of Mishneh Torah, Positive Mitzvot, Chapter 68, with English translation by Maimonides (Rambam).
להקריב בית דין קרבן אם טעו בהוראה, שנאמר: "וְאִם כָּל עֲדַת יִשְׂרָאֵל יִשְׁגּוּ" (ויקרא ד, יג).
For the [High] Court to offer a sacrifice if it renders an erroneous decision, as [Leviticus 4:13] states: "If the entire congregation of Israel shall err...."