2 Chronicles 29:12-16

Then the Levites arose: Mahath the son of Amasai and Joel the son of Azariah, from the sons of the Kohathites; and from the sons of Merari, Kish the son of Abdi and Azariah the son of Jehallelel; and from the Gershonites, Joah the son of Zimmah and Eden the son of Joah;

and from the sons of Elizaphan, Shimri and Jeiel; and from the sons of Asaph, Zechariah and Mattaniah;

and from the sons of Heman, Jehiel and Shimei; and from the sons of Jeduthun, Shemaiah and Uzziel.

They assembled their brothers, consecrated themselves, and went in to cleanse the house of the Lord, according to the commandment of the king by the words of the Lord.

So the priests went into the inner part of the house of the Lord to cleanse it, and they brought every unclean thing which they found in the temple of the Lord out to the courtyard of the house of the Lord. Then the Levites received it to carry out to the Kidron Valley.