“[Hezekiah] said to them: ‘Listen to me, you Levites! Now consecrate yourselves, so you can consecrate the temple of the Lord God of your ancestors! Remove from the sanctuary what is ceremonially unclean!'”
2 Chronicles 29.5
King Hezekiah of Judah restored temple worship. He began with the Levites. Perhaps he saw that they were more conscientious about consecrating themselves than the priests, v. 34.
Before we can worship and work acceptably before the Lord, we must consecrate ourselves by removing all that defiles in our lives.