23:15 Moreover {n} the altar that [was] at Bethel, [and] the high place which Jeroboam the son of Nebat, who made Israel to sin, had made, both that altar and the high place he brake down, and burned the high place, [and] stamped [it] small to powder, and burned the grove.
(n) Which Jeroboam had built in Israel, 1Ki 12:28,29.
23:15 Beth - el - Probably this city was now under the kingdom of Judah, to which it was added by Abijah long since. And it is probable, since the ten tribes were carried away, many cities had put themselves under the protection of Judah. The golden calf, it seems, was gone; but Josiah would leave no remains of that idolatry.
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.
