The Kohanim of the mishmar are permitted to drink wine at night, but not during the day; the Kohanim of the beis av [are] not [permitted to drink wine] during the day or during the night.  The Kohanim of the mishmar and the men of the maamad are prohibited from haircutting and laundering. However, on Thursday these [activities] are permitted, in honor of the Sabbath.