TSK
Treasury of Scripture Knowledge references in WEB.
"When Aaron and his sons have finished covering the sanctuary, and all the furniture of the sanctuary, as the camp moves forward; after that, the sons of Kohath shall come to carry it: but they shall not touch the sanctuary, lest they die. These things are the burden of the sons of Kohath in the Tent of Meeting.
and they commanded the people, saying, "When you see the ark of the covenant of Yahweh your God, and the priests the Levites bearing it, then you shall move from your place, and follow it.
Then David said, "No one ought to carry the ark of God but the Levites. For Yahweh has chosen them to carry the ark of God, and to minister to him forever."
So David, and the elders of Israel, and the captains over thousands, went to bring up the ark of the covenant of Yahweh out of the house of Obed-Edom with joy.