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.
21-23. the king commanded all the people, saying, Keep the passover unto the Lord your God, &c.—It was observed with great solemnity and was attended not only by his own subjects, but by the remnant people from Israel (see on 2Ch 35:1-19). Many of the Israelites who were at Jerusalem might have heard of, if they did not hear, the law read by Josiah. It is probable that they might even have procured a copy of the law, stimulated as they were to the better observance of Jehovah's worship by the unusual and solemn transactions at Jerusalem.