When the Kohen Gadol enters [the Heichal] to prostrate himself, three [Kohanim] would hold on to him: one on his right, one on his left, and one [holding] on [to] the precious stones. And when the appointed one heard the sound of the Kohen Gadol’s feet as he was exiting [the Heichal], he lifted the curtain for him. He entered, and prostrated himself, and exited, and his fellow Kohanim entered, and prostrated themselves, and exited.