What happened when the Kohanim left?
'Rashi': The cloud filled Beis Hashem (verse 14). It should have said so immediately, like it does in Melachim I, 8:10, just it interrupted.
What is the meaning of "Hiskadashu"?
'Rashi': They sanctified themselves for this (to serve when the Aron was brought).
What is the meaning of "Ein Lishmor l'Machlekos"?
'Rashi': The division into 24 Mishmaros of Leviyim and of Kohanim did not apply. Rather, everyone who was found sanctified themselves [to be able to participate]. Radak ? due to the many Korbanos, all joined to serve and praise (sing 1 ).
A multitude of Korbanos does not obligate more singers, just it is proper to have more in honor of the Korbanos. (PF)
