1 Chronicles 15

22. Chenaniah, chief of the Levites--He was not of the six heads of the Levitical families, but a chief in consequence of his office, which required learning, without regard to birth or family.
instructed about the song--He directed all these bands as to the proper time when each was to strike in or change their notes; or, as some render the passage, "He led the burdens, for he was skilled," that is, in the custom which it was necessary to observe in the carriage of the holy things [BERTHEAU].

23. Berechiah and Elkanah were doorkeepers--who marched immediately in front, while Obed-edom and Jeiel went in the rear, of the ark.

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.

26. it came to
they offered seven bullocks and seven rams--The Levites seem to have entered on this duty with fear and trembling; and finding that they might advance without any such indications of divine wrath as Uzza had experienced ( 1 Chronicles 13:10 ), they offered an ox and a fatted sheep immediately after starting ( 2 Samuel 6:13 ), and seven bullocks and seven rams--a perfect sacrifice, at the close of the procession ( 1 Chronicles 16:1 ). It is probable that preparations had been made for the offering of similar sacrifices at regular intervals along the way.

27. a robe of fine linen--Hebrew, Butz--is rather supposed in the later books to denote cotton.
an ephod--a shoulder-garment, a cincture or cape over his dress. It was worn by the priests, but was not so peculiar to them as to be forbidden others ( 1 Samuel 2:18 , 22:18 ).

29. Michal . . . saw . . . David dancing and playing--His movements would be slow and solemn, suitable to the grave and solemn character of the music. Though his royal robes were laid aside, he was attired like the other officials, showing a becoming humility in the immediate presence of God. The feelings manifested by Michal were only an ebullition of spleen from a proud and passionate woman.