“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:”
King James Version (KJV)
5:11 By course - According to David's appointment, #1Chron 24:1 |- 31, 25:1 - 22, which was only for the ordinary service, but in extraordinary solemnities, such as this, they all came together.