2 Chronicles 29:15
And they gathered their brethren and purified themselves, and then went at the commandment of the king by the word of the LORD, for to cleanse the house of the LORD.
2 Chronicles 30:12
And thereto the hand of God was in Judah, to make them of one accord to do the commandment of the king and the captains, which was according to the word of the LORD.
1 Chronicles 23:28
"To wait at the hands of the sons of Aaron in the service of the house of the LORD, and to have the oversight of the courts and of the store houses, and of the purifying of all holy things, and of the work of the things that served for the house of God,
2 Chronicles 29:5
and said unto them, "Hear me ye Levites: purify yourselves and hallow the house of the LORD God of your fathers, and bring out the filthiness out of the holy place.