Luke 1:5

There was in the time of Herod, the king of Judaea, a priest of the name of Zechariah, belonging to the class of Abijah. He had a wife who was a descendant of Aaron, and her name was Elizabeth.

Luke 1:8

Now while he was doing priestly duty before God in the prescribed course of his class,

Acts 13:22

After removing him, He raised up David to be their king, to whom He also bore witness when He said, "'I have found David the son of Jesse, a man I love, who will obey all My commands.'

Acts 13:36

For David, after having been useful to his own generation in accordance with God's purpose, did fall asleep, was gathered to his forefathers, and did undergo decay.

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 time of Herod, the king of Judaea, a priest of the name of Zechariah, belonging to the class of Abijah. He had a wife who was a descendant of Aaron, and her name was Elizabeth.

So had david the man of god commanded

Acts 13:22
After removing him, He raised up David to be their king, to whom He also bore witness when He said, "'I have found David the son of Jesse, a man I love, who will obey all My commands.'