The Kohen Gadol came to read. If he wished to read [wearing] his linen vestments, he may read; and if not, he would read while wearing his own white robe.  The attendant of the synagogue takes a Torah Scroll and gives it to the head of the synagogue; the head of the synagogue gives it to the Deputy [Kohen Gadol]; and the Deputy gives it to the Kohen Gadol. The Kohen Gadol stands up, accepts [the scroll] and reads while standing.  He reads [from] Acharei Mos and [the portion that begins] But on the tenth. Then he rolls up the Torah Scroll, puts it in his bosom, and says, “More than I have read to you is written here”; and he recites by heart from the Book of Numbers, beginning On the tenth.  Then he recites over it eight benedictions: for the Torah; for the [sacrificial] service; for the thanksgiving; for the forgiving of sins; for the Temple separately; for Israel separately; for Jerusalem separately; for the Kohanim separately; and for the rest of the prayer.

One who sees the Kohen Gadol when he reads cannot see the ox and the he-goat as they are burned. [And] one who sees the ox and the he-goat as they are burned cannot see the Kohen Gadol when he reads; not because he may not, but because the distance [between them] was great, and both services were performed at the same time.

If he read [the Torah] in the linen vestments, he [then] washed his hands and feet, undressed, went down [into the mikveh] and immersed himself. He came up and dried himself. They brought him the golden vestments. He dressed and washed his hands and feet. Then he went out, and sacrificed his ram, and the ram of the people, and the seven unblemished male sheep in their first year; this is the opinion of R' Eliezer.  R' Akiva says: They were brought with the daily morning offering, as well as the ox for a burnt offering. But the he-goat which is done outside were brought with the daily afternoon offering.

He washed his hands and feet, undressed, went down [into the mikveh] and immersed [himself], and came up and dried him-self. They brought him white [linen] vestments; he dressed, and washed his hands and feet.  He entered [the Holy of Holies] to remove the ladle and the shovel.  He washed his hands and feet, undressed, went down, immersed [himself], came up [from the mikveh], and dried himself.  They brought him golden vestments; he dressed, washed his hands and feet, and entered [the Holy] to burn the afternoon incense and light the lamps. Then he washed his hands and feet and undressed. They brought him his personal clothing and he dressed. Then they accompanied him to his house, and he made a feast for his friends for having left the Temple safely.

The Kohen Gadol serves in eight vestments and the common Kohen in four: in a tunic, pants, a hat, and a belt. In addition to these, the Kohen Gadol [wore] a breastplate, an ephod, a cloak, and a [golden] plate.  [Wearing] these [eight vestments], they are consulted for [the decision of] the Urim V'Tumim. They are not consulted except for a king, the Court, or for someone whom the public needs.