None ought to carry the ark of God but the Levites - Compare marginal references. We can easily understand that David, after the “breach upon Uzza” 1 Chronicles 13:11, had carefully considered all the legal requirements with respect to moving the ark, and was anxious that they should be strictly observed (compare 1 Chronicles 15:13).
Related Commentaries of 1 Chronicles 15:2
1 Chronicles 15:2
2 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.