1 Chronicles 15:2

15:2 Then David said, “Only the Levites may carry the ark of God, for the Lord chose them to carry the ark of the Lord and to serve before him perpetually.

1 Chronicles 15:12-15

15:12 He told them: “You are the leaders of the Levites’ families. You and your relatives must consecrate yourselves and bring the ark of the Lord God of Israel up to the place I have prepared for it. 15:13 The first time you did not carry it; that is why the Lord God attacked us, because we did not ask him about the proper way to carry it.” 15:14 The priests and Levites consecrated themselves so they could bring up the ark of the Lord God of Israel. 15:15 The descendants of Levi carried the ark of God on their shoulders with poles, just as Moses had ordered according to the divine command.