3,926. The Kohein Gadol's Dignity

Hilchos Klei HaMikdash 5:3

The Kohein Gadol is obligated to behave in a dignified manner and may not act silly with other people. They may not see him in a state of undress, in the bathhouse, in the lavatory or when he’s having his hair cut. This is as per Leviticus 21:10: “the kohein greater than his brothers,” meaning that he must be treated with great respect. However, if he wants to allow others to use the bathhouse with him, he may do so.

Hilchos Klei HaMikdash 5:4

The Kohein Gadol may not attend a party or a public gathering even for the sake of a mitzvah, though he may go to a house of mourning if he so desires. If he does go, he doesn’t walk alongside the other kohanim. Rather, they surround him and show honor to him. The Deputy Kohein Gadol serves as liaison between the Kohein Gadol and the people. The Deputy Kohein Gadol and an anointed Kohein Gadol who served temporarily stand to the right of the Kohein Gadol, while the head of the family on duty in the Temple, the mourners and all others stand to his left. He wishes the mourners comfort and they honor him as their situation allows.