Jamieson, Fausset and Brown on 1 Chronicles 15:25

25. So David, and the elders ... and captains ... went--The pious design of David in ordering all his principal ministers and officers to take part in this solemn work and imparting so much pomp and imposing ceremony to the procession, was evidently to inspire the popular mind with a profound veneration for the ark and to give the young especially salutary impressions of religion, which would be renewed by the remembrance that they had been witnesses of the august solemnity in which the king and the highest aristocracy of the land participated, vying with all other classes to do honor to the God of Israel.