On the first three fast days, the Kohanim of the mishmar fast but do not complete [their fast]; the Kohanim of the beis av do not fast at all. On the second three [fast days], the Kohanim of the mishmar fast and complete [their fast]; the Kohanim of the beis av fast but do not complete [their fast]. On the last seven [fast days], both groups fast and complete [their fast]; this is the opinion of R' Yehoshua.  But the Sages say: On the first three fast days neither group fasts at all. On the second three [fast days], the Kohanim of the mishmar fast but do not complete [their fast], and the Kohanim of the beis av do not fast at all. On the last seven [fast days], the Kohanim of the mishmar fast and complete [their fast], and the Kohanim of the beis av fast but do not complete [their fast].

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.