1 Chronicles 15:2-6

Then David said, None ought to carry the ark of God but the Levites: for them hath the LORD chosen to carry the ark of God, and to minister unto him for ever.

And David gathered all Israel together to Jerusalem, to bring up the ark of the LORD unto his place, which he had prepared for it.

And David assembled the children of Aaron, and the Levites:

Of the sons of Kohath; Uriel the chief, and his brethren an hundred and twenty:

Of the sons of Merari; Asaiah the chief, and his brethren two hundred and twenty: