משנה אויף דברים 17:12

If one fled after having been convicted at a court and again comes up before the same court, the [first] judgment is not set aside. Wherever two witnesses stand up and declare, “We testify that so and so was tried and convicted at a certain court and that so and so were the witnesses” the accused is executed. [Trials before] a sanhedrin are customary both in the land [of Israel] and outside it. A sanhedrin that executes once in seven years, is called murderous. Rabbi Eliezer b. Azariah Says: once in seventy years. Rabbi Tarfon and Rabbi Akiva say: “Had we been members of a sanhedrin, no person would ever be put to death. Rabban Shimon ben Gamaliel remarked: “They would also multiply murderers in Israel.”

An elder rebelling against the ruling of the court [is strangled], for it says, “If there arise a matter too hard for you for judgement […you shall promptly repair to the place that the Lord your God will have chosen, and appear before the levitical priests, or the magistrate in charge at the time, and present your problem. When they have announced to you the verdict in the case, you shall carry out the verdict that is announced to you from that place that the Lord chose, observing scrupulously all their instructions to you. You shall act in accordance with the instructions given you and the ruling handed down to you; you must not deviate from the verdict that they announce to you either to the right or to the left. Should a man act presumptuously and disregard the priest charged with serving there the Lord your God, or the magistrate, that man shall die” (Deut. 17:8-13, JPS translation). Three courts of law were there, one situated at the entrance to the Temple mount, another at the door of the [Temple] court, and the third in the Chamber of Hewn Stone. They [first] went to the court which is at the entrance to the Temple mount, and he [the rebellious elder] stated, “Thus have I expounded and thus have my colleagues expounded; thus have I taught, and thus have my colleagues taught.” If [this first court] had heard [a ruling on the matter], they state it. If not, they go to the [second court] which is at the entrance of the Temple court, and he declares, “Thus have I expounded and thus have my colleagues expounded; thus have I taught, and thus have my colleagues taught.” If [this second court] had heard [a ruling on the matter] they state it; if not, they all proceed to the great court of the Chamber of Hewn Stone from whence instruction issued to all Israel, for it says, [you shall carry out the verdict that is announced to you] from that place that the Lord chose (Deut. 17:10). If he returned to his town and taught again as he did before, he is not liable. But if he gave a practical decision, he is guilty, for it says, “Should a man act presumptuously” (Deut. 17:12) he is liable only for a practical ruling. But if a disciple gave a practical decision [opposed to the court], he is exempt: thus his stringency is his leniency.