Treasury of Scripture Knowledge
For they performed the
worship of their God and the service of purification, together with the singers and the gatekeepers in accordance with the command of David and of his son Solomon.
2 Chronicles 29:5
Then he said to them, “Listen to me, O Levites.
Consecrate yourselves now, and consecrate the house of the Lord, the God of your fathers, and carry the uncleanness out from the holy place.