Reference for Sanhedrin 45:23

תניא נמי הכי לעולם פוסל והולך עד שיקבל עליו ב"ד שמומחה לרבים דברי ר"מ

of the people in Jerusalemused to act thus: They would not sign a deed without knowing who would signwith them; they would not sit in judgment unless they knew who was to sitwith them; and they would not sit at table without knowing their fellow diners.

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