2 Chronicles 29:13-17

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.

Now they began the consecration on the first day of the first month, and on the eighth day of the month they entered the porch of the Lord. Then they consecrated the house of the Lord in eight days, and finished on the sixteenth day of the first month.