דברי הימים ב לה:יג פירוש: רש״י

And they cooked the Passover sacrifice with fire according to the law Exod. 12:8): “Roasted with fire.”

and carried them quickly to all the members of the people [i.e.] the Levites [did this]; and after they had prepared for all Israel, the Levites prepared for themselves and for the priests, who did not have time to prepare.