ד אע"פ שב"ד של שלשה ב"ד שלם הוא כל זמן שהם רבים הרי זה משובח ומוטב שיחתוך הדין בי"א מבעשרה וצריך שיהיו כל היושבים בב"ד ת"ח וראוים ואסור לאדם חכם שישב בדין עד שידע עם מי יושב שמא ישב עם אנשים שאינם הגונים ונמצא בכלל קשר בוגדים לא בכלל ב"ד מי שאינו מומחה ולא קבלוהו עליו בעלי דינים אע"פ שנטל רשות מראש הגולה אין דינו דין אפי' לא טעה וכל א' מבעלי דינים אם רצה חוזר ודן בפני ב"ד: הגה רשות שנותן המלך עכו"ם בזמן הזה אינו כלום ומיהו אם קבלוהו הקהל ע"פ כתב המלך יכול לדין (טור) וי"א דאם גמיר וסביר מהני ליה רשות המלך (ריב"ש סי' רע"א) או השר הממונה בעירו דזהו בכלל דינא דמלכותא להושיב דיינים ושופטים מי שירצה ומ"מ מי שעושה זה בלא רשות הקהל מצער הצבור ועתיד ליתן את הדין (תשובת רשב"א סי' תרל"ז):
4 Although a Court of Law of three is considered complete, — [yet], whenever they [the Judges] are many it is regarded as praiseworthy and it is better that the law be decided by eleven than by ten [Judges]. It is required that all who sit in the Court of Law be scholars and worthy [of their office]. It is forbidden for a wise man to sit in judgment until he knows with whom he sits lest he sit with people who are not suitable and is [then] found to be included in a council of conspirators and not in a Court of Law. One who is not an authorized Judge [ Mumḥeh ] and the litigants did not accept him upon themselves, although he obtained authorization from the Exilarch, his decision is not binding, even if he did not err [in his ruling], and [consequently] each one of the litigants may, if he so desires, retract and plead [his case anew] before a [competent] Court of Law. Rema: Authorization which a ruler nowadays grants [ to an individual Judge ] is of no consequence. However, if the community accepted him in accord with the written decree of the ruler, he may act as Judge. And some say that if he [ the Judge ] is versed in law and possesses reasoning power, — the ruler's authorization has legal effect for him, or [ likewise, the authorization of ] the officer who was appointed in his town [ has legal effect for him ], — for this comes under the category of the law of the State, [ viz.,], to appoint [ as ] Judges and Magistrates whomever he desires. Nevertheless, whosoever does this without the permission of the community, annoys the general public and is destined to give an account [ of his actions in the world to come ].