1 Chronicles (Author Compiled by Isaiah and Ezra from records of Nathan, Gad, Iddo, Ahijah, Jehu and others.)
15:2Then David said, None ought to carry the ark of God but the Levites, for them has Jehovah chosen to carry the ark of God, and to serve him for ever.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.