פירוש על מלכים ב 23:4

The kohanim of the second rank. The assistants of the priesthood,²The kohein who was anointed for war was also included in this group.—Metzudas Dovid who are second in rank³They would substitute for the kohein gadol in the event that he was incapacitated to perform the service in the Beis Hamikdosh.—Radak to the Kohanim Gedolim.

And the gatekeepers. The supervisors in charge over all the necessities of the Beis [Hamikdosh], and the keys of the Temple's courtyard were in their charge.⁴See Rashi above, 12:10.

In the plains of Kidron. In the plains of Kidron.

And he carried their ashes to Beis Eil. To an unclean place, where he defiled the altar that Yorovom had made,⁵See v. 15 below. and he burned upon it the priests of the high places.