Luke 1:8

And when he was performing the priest's office in the order of his class before God, it fell to his lot,

Luke 1:5

In the days of Herod the king of Judea, there was a certain priest by the name of Zachariah, of the class of Abijah; and his wife was of the daughters of Aaron, and her name was Elizabeth.

Treasury of Scripture Knowledge

Summary

And it came to pass, that while he executed the priest's office before God in the order of his course,

Bible References

In

Luke 1:5
In the days of Herod the king of Judea, there was a certain priest by the name of Zachariah, of the class of Abijah; and his wife was of the daughters of Aaron, and her name was Elizabeth.