The Role of the Sanhedrin according to the Mishnah

A tribe, a false prophet, or the high priest may not be tried except by the court of seventy-one. They may not send forth the people to wage a battle of free choice save by the decision of the court of one and seventy. They may not add to the city [of Jerusalem] or the courts of the Temple except by the decision of the court of seventy-one. They may not set up Sanhedrins for the several tribes except by the decision of the court of one and seventy. And they may not proclaim [any city to be] an apostate city [see Deuteronomy 13:13–19] except by the decision of one and seventy. No city on the frontier may be proclaimed an apostate city, nor three together, but only one or two.

Adapted from the translation ofJoshua Kulp.