They reached [the area] between the Antechamber and the Altar; one [Kohen] took the “shovel” and threw it between the Antechamber and the Altar.  A person could not hear the voice of his fellow in Jerusalem due to the sound of the “shovel.” And [the sound] served three purposes: A Kohen who heard its sound would know that his brethren, the Kohanim, would be entering [the Heichal] to prostrate themselves, and he would run and come. And a Levi who heard its sound would know that his brethren, the Leviim, would be entering [the Courtyard] to chant the song, and he would run and come. And the head of the maamad would post the tamei [Kohanim] at the eastern gateway [to the Temple Mount].