3,933. Maamados

Hilchos Klei HaMikdash 5:17

If a kohein who has never before served in the Temple is appointed Kohein Gadol, he must bring a flour offering of one-tenth of an ephah and offer it himself like the induction of any regular kohein. He then offers a second flour offering as the induction of a Kohein Gadol. He then offers a third flour offering, the chavitin, which the Kohein Gadol offers every day; this will be discussed IY”H in Hilchos Temidin u’Musafin. All three of these are offered in the same way.

Hilchos Klei HaMikdash 6:1

A person’s sacrifice can’t be offered unless he is present. The communal offerings are brought on behalf of all Jews, but obviously it’s impossible for all Jews to stand in the courtyard while they’re being offered. Therefore, the early prophets enacted that certain upright and pious Jews would serve as representatives of all Jews, standing by and watching the sacrifices being offered. These representatives were called the maamad (from the word meaning to stand). There were twenty-four maamados, corresponding to the watches of kohanim and Leviim. One member of each maamad was appointed as leader, called the head of the maamad.