luke 1:5 There was in the days of Herod, the king of Judaea, a certain priest named Zacharias, of the course of Abia: and his wife was of the daughters of Aaron, and her name was Elisabeth. - Free Bible Online

      Lu 1:5-25. ANNOUNCEMENT OF THE FORERUNNER.

      5. Herod--(See on Mt 2:1).
      course of Abia--or Abijah; the eighth of the twenty-four orders of courses into which David divided the priests (see 1Ch 24:1, 4, 10). Of these courses only four returned after the captivity (Ezr 2:34-39), which were again subdivided into twenty-four--retaining the ancient name and order of each. They took the whole temple service for a week each.
      his wife was of the daughters of Aaron--The priests might marry into any tribe, but "it was most commendable of all to marry one of the priests' line" [LIGHTFOOT].

JFB.