Luke 1:5

There was in the days of Herod, the king of Judea, a certain priest, by name Zacharias, of the course of Ahijah, and his wife of the daughters of Aaron, and her name Elizabeth.

Luke 1:8

And it came to pass, while he was officiating in the order of his course before God,

Acts 13:22

and having deposed him, he raised up to them David for a king; to whom witnessing he also said, I have found David the son of Jesse, a man according to my own heart, who will do all my wishes.

Acts 13:36

For David, indeed having served his own generation according to the will of God, went to sleep, and did see corruption:

Treasury of Scripture Knowledge

Summary

And he appointed, according to the order of David his father, the courses of the priests to their service, and the Levites to their charges, to praise and minister before the priests, as the duty of every day required: the porters also by their courses at every gate: for so had David the man of God commanded.

The courses

So had david the man of god commanded

Bible References

The courses

Luke 1:5
There was in the days of Herod, the king of Judea, a certain priest, by name Zacharias, of the course of Ahijah, and his wife of the daughters of Aaron, and her name Elizabeth.

So had david the man of god commanded

Acts 13:22
and having deposed him, he raised up to them David for a king; to whom witnessing he also said, I have found David the son of Jesse, a man according to my own heart, who will do all my wishes.