He appointed the priests to their duties and encouraged them in the service of the house of the LORD.
The destruction which Josiah made of idols and idolatry was more largely related in the Kings, but just mentioned here in the foregoing chapter (v. 33); but his solemnizing the passover, which was touched upon there (Kg2 23:21), is very particularly related here. Many were the feasts of the Lord, appointed by the ceremonial law, but the passover was the chief.
Commenting on 2 Chronicles 35:1-19
And he set the priests in their charges,.... In their offices, and in their proper places, to execute them: and encouraged them to the service of the house of the Lord; to attend it with cheerfulness and constancy, and do it according to the will of God, promising his favour and protection.
2Ch 35:2 He appointed the priests according to their guards or posts, i.e., according to the service incumbent upon each division, and “he strengthened them for the service of the house of Jahve,” namely, by encouraging speech, and by teaching as to the duties devolving upon them, according to the provisions of the law. Cf. the summons of Hezekiah, 2Ch 29:5.; and as to the יחזּק, Neh 2:18.