15 And the altar at Beth-el, and the high place put up by Jeroboam, the son of Nebat, who made Israel do evil, that altar and that high place were pulled down; and the high place was burned and crushed to dust and the Asherah was burned. 16 Then Josiah, turning round, saw on the mountain the places of the dead, and he sent and had the bones taken out of their places and burned on the altar, so making it unclean, as the Lord had said by the man of God when Jeroboam was in his place by the altar on that feast-day. And he, turning his eyes to the resting-place of the man of God who had given word of these things, said: 17 What is that headstone I see over there? And the men of the town said to him, It is the resting-place of the man of God who came from Judah and gave word of all these things which you have done to the altar of Beth-el. 18 So he said, Let him be; let not his bones be moved. So they let his bones be with the bones of the prophet who came from Samaria.
Matthew Henry's Commentary on 2 Kings 23:15-18
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.