Luke 1:8

And it came to pass, as he discharged his priestly office in the order of his periodical ministration before God,

Luke 1:5

There was in the days of Herod, the king of Judea, a certain priest named Zacharias, of the course of Abiah: and his wife of the daughters of Aaron, and her name Elisabeth.

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
There was in the days of Herod, the king of Judea, a certain priest named Zacharias, of the course of Abiah: and his wife of the daughters of Aaron, and her name Elisabeth.