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.

If one day intervened between them, the watch whose time was fixed took ten loaves, and the one that stayed behind took two. But during the rest of the year, the incoming [watch] took six [loaves] and the outgoing [watch] took six. R’ Yehudah says: The incoming [watch] took seven and the outgoing [watch] took five.  The incoming [watch] divided [the bread] in the north and the outgoing [watch] in the south.  [The watch of] Bilgah always divided [the bread] in the south, its ring was permanently affixed, and its window was sealed.