During three periods of the year all [twenty-four] watches were equal in the prescribed offerings of the festivals and in the division of the Panim Bread.  On Shavuos they would say to him, “Here is matzah for you; here is chametz for you!”  The watch whose time [of service] was fixed —- [only] it offers the daily burnt-offerings, vow-offerings, freewill-offerings, the remaining public offerings, and [this watch] offers everything.  If a festival fell near a Sabbath, either before it or after it, all the watches shared equally in the division of the Panim Bread.