Nehemiah 13:9

and commanded them to cleanse the chest. And thither brought I again the vessels of the house of God, the meat offering and the incense.

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.

2 Chronicles 29:15-19

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.

Nehemiah 12:45

that they stood and waited upon the office of their God, and the office of the purification. And the singers and porters stood after the commandment of David and of Solomon his son:

Treasury of Scripture Knowledge

Summary

Then I commanded, and they cleansed the chambers: and thither brought I again the vessels of the house of God, with the meat offering and the frankincense.

Bible References

They cleansed

Nehemiah 12:45
that they stood and waited upon the office of their God, and the office of the purification. And the singers and porters stood after the commandment of David and of Solomon his son:
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.