אִי אֶפְשָׁר שֶׁיִּהְיֶה קָרְבָּנוֹ שֶׁל אָדָם קָרֵב וְהוּא אֵינוֹ עוֹמֵד עַל גַּבָּיו. וְקָרְבְּנוֹת הַצִּבּוּר הֵן קָרְבָּן שֶׁל כָּל יִשְׂרָאֵל וְאִי אֶפְשָׁר שֶׁיִּהְיוּ יִשְׂרָאֵל כֻּלָּן עוֹמְדִין בָּעֲזָרָה בִּשְׁעַת קָרְבָּן. לְפִיכָךְ תִּקְּנוּ נְבִיאִים הָרִאשׁוֹנִים שֶׁיִּבְרְרוּ מִיִּשְׂרָאֵל כְּשֵׁרִים וִירֵאֵי חֵטְא וְיִהְיוּ שְׁלוּחֵי כָּל יִשְׂרָאֵל לַעֲמֹד עַל הַקָּרְבָּנוֹת וְהֵם הַנִּקְרָאִים אַנְשֵׁי מַעֲמָד. וְחִלְּקוּ אוֹתָם כ"ד מַעֲמָדוֹת כְּמִנְיַן מִשְׁמְרוֹת כְּהֻנָּה וּלְוִיָּה. וְעַל כָּל מַעֲמָד וּמַעֲמָד אֶחָד מֵהֶן מְמֻנֶּה עַל כֻּלָּם וְהוּא נִקְרָא רֹאשׁ הַמַּעֲמָד:
It is impossible for the sacrifice of a person to be offered without him standing in attendance. [Now,] the communal offerings are the sacrifices of the entire Jewish people, but it is impossible for the entire Jewish people to stand in the Temple Courtyard at the time they are being offered. Therefore, the prophets of the first era ordained that there be selective upright and sin-fearing Jews who should serve as the agents of the entire Jewish people to stand [and observe the offering of] the sacrifices. They were called "the men of the maamad." They divided them into 24 ma'amadot, equaling the number of watches of the priests and Levites. Over each of the watches was one who was appointed as [the supervisor] of them all. He was called the head of the ma'amad.
