John Gill Commentary 1 Chronicles 28:1

"And David assembled all the princes of Israel, the princes of the tribes, and the captains of the companies that served the king by course, and the captains of thousands, and the captains of hundreds, and the rulers over all the substance and possessions of the king and of his sons, with the officers, and the mighty men, even all the mighty men of valor, unto Jerusalem." — 1 Chronicles 28:1 (ASV)

And David assembled all the princes of Israel, the princes
of the tribes
Whose names are given in (1 Chronicles 27:16–22)

and the captains of the companies that ministered to the king by
course ;
monthly, each having 24,000 men under him, whose names are expressed, (1 Chronicles 27:2–15)

and the captains over the thousands ;
of which there were twenty four in a course, at the head of each 1000, under the chief captain:

and captains over the hundreds :
centurions under the second captains:

and the stewards over all the substance and possession of the king,
and of his sons ;
whose names may be read in (1 Chronicles 27:25–31)

with the officers :
the courtiers:

and with the mighty men, and with all the valiant men ;
both men of valour, and of wealth and riches: these David

assembled unto Jerusalem ;
the metropolis of the kingdoms and where his court and palace were.