1 Chronicles 15:11-15

And David called for Zadok and Abiathar the priests, and for the Levites, for Uriel, Asaiah, and Joel, Shemaiah, and Eliel, and Amminadab,

And said unto them, Ye are the chief of the fathers of the Levites: sanctify yourselves, both ye and your brethren, that ye may bring up the ark of the LORD God of Israel unto the place that I have prepared for it.

For because ye did it not at the first, the LORD our God made a breach upon us, for that we sought him not after the due order.

So the priests and the Levites sanctified themselves to bring up the ark of the LORD God of Israel.

And the children of the Levites bare the ark of God upon their shoulders with the staves thereon, as Moses commanded according to the word of the LORD.