“priestly division of Abijah.” 1 Chronicles 24:1-19 recounts how King David organized the priests, the sons of Aaron, into 24 divisions. The eighth division was the division or “course” of Abijah (1 Chron. 24:10). Each division was on duty twice a year for a one-week period, and also served at the three major feasts of the year: Passover, Pentecost, and Tabernacles. After the Babylonian captivity only four divisions returned (Ezra 2:36-39), but these four were divided into twenty-four divisions, given the names of the original twenty-four, and then continued on with their duties according to the traditional timing (Hendriksen). The eighth division of Abijah that Zechariah was serving would have been the last week of May, 4 B.C.