Mishnayos Sanhedrin Perek 1 Mishnah 6

With regard to the number of judges in the different courts the mishna presents a halakhic midrash: The Great Sanhedrin was composed of seventy-one judges, and a lesser Sanhedrin was composed of twenty-three. From where is it derived that the Great Sanhedrin was composed of seventy-one judges? As it is stated: “Gather Me seventy men of the Elders of Israel, whom you know to be the Elders of the people and officers over them, and bring them into the Tent of Meeting, and they shall stand there with you” (Numbers 11:16), and together with Moses at the head of this body, there are a total of seventy-one. Rabbi Yehuda says: Moses was indeed at the head of the body, but he is not counted as part of the group. Consequently, a future Great Sanhedrin modeled after these Elders is to be composed of seventy judges. And from where is it derived that a lesser Sanhedrin is composed of twenty-three judges? As it is stated: “And the congregation shall judge between the assailant and the avenger…and the congregation shall save the manslayer from the hands of the avenger” (Numbers 35:24–25). Therefore, there must be a congregation, which consists of at least ten judges, that judges the accused and attempts to convict him, and there must be a congregation, also consisting of at least ten judges, which attempts to save the accused by finding him innocent. Together, there are twenty judges here. Before proceeding to derive the requirement for the final three judges, the mishna clarifies: And from where is it derived that a congregation consists of at least ten men? As it is stated concerning the spies: “How long shall I bear with this evil congregation that keep complaining about me?” (Numbers 14:27) There were twelve spies; excluding Joshua and Caleb, who did not complain, there would be ten men who are called: A congregation. Accordingly, the verses describing a congregation that attempts to convict the accused and a congregation that attempts to acquit him together add up to twenty judges. And from where is it derived to bring three more judges to the court? From the implication of that which is stated: “You shall not follow a multitude to convict” (Exodus 23:2), I would derive that I may not convict a person on the basis of a majority but I should follow the majority to exonerate. If so, why is it stated in the same verse: “To incline after a multitude,” from which it can be understood that the majority is followed in all cases? In order to resolve the apparent contradiction it must be explained: Your inclination after the majority to exonerate is not like your inclination after the majority to convict. Your inclination after the majority to exonerate can result in a verdict by a majority of one judge. But your inclination after the majority to convict a transgressor must be by a more decisive majority of at least two. Therefore, the court must have at least twenty-two judges. And since there is a principle that a court may not be composed of an even number of judges, as such a court may be unable to reach a decision, therefore they add another one to them, and there are twenty-three judges here. And how many men must be in the city for it to be eligible for a lesser Sanhedrin? One hundred and twenty. Rabbi Neḥemya says: Two hundred and thirty, corresponding to the ministers of tens, as outlined by Moses and Yitro in the wilderness (Exodus, chapter 18). That is to say, each member of the Sanhedrin can be viewed as a judge with responsibility for ten residents. If there are not enough men in the city to enable this calculation, it would not be honorable to appoint a Sanhedrin, as their members will each preside over less than the minimum of ten residents.

סַנְהֶדְרִי גְדוֹלָה הָיְתָה שֶׁל שִׁבְעִים וְאֶחָד, וּקְטַנָּה שֶׁל עֶשְׂרִים וּשְׁלֹשָׁה. וּמִנַּיִן לַגְּדוֹלָה שֶׁהִיא שֶׁל שִׁבְעִים וְאֶחָד, שֶׁנֶּאֱמַר (במדבר יא) אֶסְפָה לִּי שִׁבְעִים אִישׁ מִזִּקְנֵי יִשְׂרָאֵל, וּמֹשֶׁה עַל גַּבֵּיהֶן, הֲרֵי שִׁבְעִים וְאֶחָד. רַבִּי יְהוּדָה אוֹמֵר, שִׁבְעִים. וּמִנַּיִן לַקְּטַנָּה שֶׁהִיא שֶׁל עֶשְׂרִים וּשְׁלֹשָׁה, שֶׁנֶּאֱמַר (שם לה) וְשָׁפְטוּ הָעֵדָה וְגוֹ' וְהִצִּילוּ הָעֵדָה, עֵדָה שׁוֹפֶטֶת וְעֵדָה מַצֶּלֶת, הֲרֵי כָאן עֶשְׂרִים. וּמִנַּיִן לָעֵדָה שֶׁהִיא עֲשָׂרָה, שֶׁנֶּאֱמַר (שם יד) עַד מָתַי לָעֵדָה הָרָעָה הַזֹּאת, יָצְאוּ יְהוֹשֻׁעַ וְכָלֵב. וּמִנַּיִן לְהָבִיא עוֹד שְׁלֹשָׁה, מִמַּשְׁמַע שֶׁנֶּאֱמַר (שמות כג) לֹא תִהְיֶה אַחֲרֵי רַבִּים לְרָעֹת, שׁוֹמֵעַ אֲנִי שֶׁאֶהְיֶה עִמָּהֶם לְטוֹבָה, אִם כֵּן לָמָּה נֶאֱמַר (שם) אַחֲרֵי רַבִּים לְהַטֹּת, לֹא כְהַטָּיָתְךָ לְטוֹבָה הַטָּיָתְךָ לְרָעָה. הַטָּיָתְךָ לְטוֹבָה עַל פִּי אֶחָד, הַטָּיָתְךָ לְרָעָה עַל פִּי שְׁנַיִם, וְאֵין בֵּית דִּין שָׁקוּל, מוֹסִיפִין עֲלֵיהֶם עוֹד אֶחָד, הֲרֵי כָאן עֶשְׂרִים וּשְׁלֹשָׁה. וְכַמָּה יְהֵא בְעִיר וּתְהֵא רְאוּיָה לְסַנְהֶדְרִין, מֵאָה וְעֶשְׂרִים. רַבִּי נְחֶמְיָה אוֹמֵר, מָאתַיִם וּשְׁלשִׁים, כְּנֶגֶד שָׂרֵי עֲשָׂרוֹת: