By course — According to David's appointment, 1 Chronicles 24:1-31, 1 Chronicles 25:1-22, which was only for the ordinary service, but in extraordinary solemnities, such as this, they all came together.
Related Commentaries of 2 Chronicles 5:11
2 Chronicles 5:11
11 And it came to pass, when the priests were come out of the holy place: (for all the priests that were present were sanctified, and did not then wait by course: