Luke 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.
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