15 Moreover the altar that was at Beth-el, and the high place which Jeroboam the son of Nebat, who made Israel to sin, had made, even that altar and the high place he brake down; and he burned the high place and beat it to dust, and burned the Asherah. 16 And as Josiah turned himself, he spied the sepulchres that were there in the mount; and he sent, and took the bones out of the sepulchres, and burned them upon the altar, and defiled it, according to the word of Jehovah which the man of God proclaimed, who proclaimed these things. 17 Then he said, What monument is that which I see? And the men of the city told him, It is the sepulchre of the man of God, who came from Judah, and proclaimed these things that thou hast done against the altar of Beth-el. 18 And he said, Let him be; let no man move his bones. So they let his bones alone, with the bones of the prophet that came out of Samaria. 19 And all the houses also of the high places that were in the cities of Samaria, which the kings of Israel had made to provoke [Jehovah] to anger, Josiah took away, and did to them according to all the acts that he had done in Beth-el. 20 And he slew all the priests of the high places that were there, upon the altars, and burned men's bones upon them; and he returned to Jerusalem.
21 And the king commanded all the people, saying, Keep the passover unto Jehovah your God, as it is written in this book of the covenant. 22 Surely there was not kept such a passover from the days of the judges that judged Israel, nor in all the days of the kings of Israel, nor of the kings of Judah; 23 but in the eighteenth year of king Josiah was this passover kept to Jehovah in Jerusalem.
24 Moreover them that had familiar spirits, and the wizards, and the teraphim, and the idols, and all the abominations that were seen in the land of Judah and in Jerusalem, did Josiah put away, that he might confirm the words of the law which were written in the book that Hilkiah the priest found in the house of Jehovah.
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.