15 Moreover, the altar at Bethel, the high place erected by Jeroboam the son of Nebat, who made Israel to sin, that altar with the high place he pulled down and burned,[1] reducing it to dust. He also burned the Asherah. 16 And as Josiah turned, he saw the tombs there on the mount. And he sent and took the bones out of the tombs and burned them on the altar and defiled it, according to the word of the Lord that the man of God proclaimed, who had predicted these things. 17 Then he said, "What is that monument that I see?" And the men of the city told him, "It is the tomb of the man of God who came from Judah and predicted[2] these things that you have done against the altar at Bethel." 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 who came out of 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.