15 Next, he took care of the altar at the shrine in Bethel that Jeroboam son of Nebat had built - the same Jeroboam who had led Israel into a life of sin. He tore apart the altar, burned down the shrine leaving it in ashes, and then lit fire to the phallic Asherah-pole. 16 As Josiah looked over the scene, he noticed the tombs on the hillside. He ordered the bones removed from the tombs and had them cremated on the ruined altars, desacralizing the evil altars. This was a fulfillment of the word of God spoken by the Holy Man years before when Jeroboam had stood by the altar at the sacred convocation. 17 Then the king said, "And that memorial stone - whose is that?" The men from the city said, "That's the grave of the Holy Man who spoke the message against the altar at Bethel that you have just fulfilled." 18 Josiah said, "Don't trouble his bones." So they left his bones undisturbed, along with the bones of the prophet from Samaria. 19 But Josiah hadn't finished. He now moved through all the towns of Samaria where the kings of Israel had built neighborhood sex-and-religion shrines, shrines that had so angered God. He tore the shrines down and left them in ruins - just as at Bethel 20 He killed all the priests who had conducted the sacrifices and cremated them on their own altars, thus desacralizing the altars. Only then did Josiah return to Jerusalem.
21 The king now commanded the people, "Celebrate the Passover to God, your God, exactly as directed in this Book of the Covenant. 22 This commanded Passover had not been celebrated since the days that the judges judged Israel - none of the kings of Israel and Judah had celebrated it. 23 But in the eighteenth year of the rule of King Josiah this very Passover was celebrated to God in Jerusalem.
24 Josiah scrubbed the place clean and trashed spirit-mediums, sorcerers, domestic gods, and carved figures - all the vast accumulation of foul and obscene relics and images on display everywhere you looked in Judah and Jerusalem. Josiah did this in obedience to the words of God's Revelation written in the book that Hilkiah the priest found in The Temple of God.
Matthew Henry's Commentary on 2 Kings 23:15-24
Commentary on 2 Kings 23:15-24
(Read 2 Kings 23:15-24)
Josiah's zeal extended to the cities of Israel within his reach. He carefully preserved the sepulchre of that man of God, who came from Judah to foretell the throwing down of Jeroboam's altar. When they had cleared the country of the old leaven of idolatry, then they applied themselves to the keeping of the feast. There was not holden such a passover in any of the foregoing reigns. The revival of a long-neglected ordinance, filled them with holy joy; and God recompensed their zeal in destroying idolatry with uncommon tokens of his presence and favour. We have reason to think that during the remainder of Josiah's reign, religion flourished.