“Also the Levites which were the singers, all of them of Asaph, of Heman, of Jeduthun, with their sons and their brethren, being arrayed in white linen, having cymbals and psalteries and harps, stood at the east end of the altar, and with them an hundred and twenty priests sounding with trumpets:)”
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.
5:14 Glory of the Lord - And this beautified it more than all the gold with which it was overlaid, or the precious stones with which it was garnished. Yet even that was no glory, in comparison of the glory of the gospel - dispensation.