“Then King David summoned the priests Zadok and Abiathar, and the Levites Uriel, Asaiah, Joel, Shemaiah, Eliel, and Amminadab. King David said to them. ‘You are the heads of families of the Levites. Sanctify yourselves, you and your kindred, so that you may bring up the ark of Yahweh, the God of Israel, to the place that I have prepared for it. Because you did not carry it the first time, Yahweh our God burst out against us, because we did not give it proper care.’ So the priests and the Levites sanctified themselves to bring up the ark of Yahweh, the God of Israel. The Levites carried the ark of God on their shoulders with the poles, as Moses had commanded according to the word of Yahweh.”
The high priests Zadok and Abiathar were also involved. King David summoned the heads of the Levite families just mentioned, except for Uriel. He wanted them to sanctify themselves and their clan. King David said that the problem last time was that the right people were not carrying the Ark of the Covenant. He wanted the Kohathite Levites to carry the Ark of the Covenant with poles on their shoulders as it was laid out in Numbers, chapter 7.