and said to them, You are the heads of the fathers' [houses] of the Levites: sanctify yourselves, both you and your brothers, that you may bring up the ark of Yahweh, the God of Israel, to [the place] that I have prepared for it.
The writer then goes back to the story of the ark and shows how, after the earlier setback, it was finally brought to Jerusalem. Nothing disastrous happened this time, because the ark was transported in the proper manner and handled with fitting reverence. It was carried on the shoulders of the Levites, who themselves were ceremonially cleansed (15:1-15; see notes on 2 Samuel 6:12-15).