“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.”
King James Version (KJV)
1:5 The course of Abia - The priests were divided into twenty - four courses, of which that of Abia was the eighth, #1Ch 24:10|. Each course ministered in its turn, for seven days, from Sabbath to Sabbath. And each priest of the course or set in waiting, had his part in the temple service assigned him by lot.
Lu 1:5 There was in the days of Herod. For Herod, see PNT "Mt 2:1". A certain priest. Not a chief priest, but one belonging to the courses. The course of Abia. All the priests were divided into twenty-four courses, or classes. That of Abijah was the eighth course (1Ch 24:10); each course took charge of the temple worship in succession, for a week at the time, beginning on a Sabbath. The heads of these twenty-four courses are "the chief priests" so often spoken of in the New Testament. His wife [was] of the daughters of Aaron. Elizabeth also was of priestly family.