1 Chronicles 15:12-14

12David said to them, ‘You are the leaders of the Levites' clans. You and your relatives must make yourselves holy. Then you will be able to carry the Covenant Box of the Lord, Israel's God. You must bring it to the place that I have prepared for it.

13The first time that we tried to bring it here, you did not carry it. Because of that, the Lord our God punished us. He did that because we did not ask him about the proper way to carry it.’

14So the priests and the other Levites made themselves holy. Then they could carry the Covenant Box of the Lord, Israel's God.