Complete Commentary on the Whole Bible, by Matthew Henry, at sacred-texts.com
4 Kings (2 Kings) Chapter 23
(Kg2 23:1-3) Josiah reads the law, and renews the covenant.
(Kg2 23:4-14) He destroys idolatry.
(Kg2 23:15-24) The reformation extended to Israel, A passover kept.
(Kg2 23:25-30) Josiah slain by Pharaoh-nechoh.
(Kg2 23:31-37) Wicked reigns of Jehoahaz and Jehoiakim.
Josiah had received a message from God, that there was no preventing the ruin of Jerusalem, but that he should only deliver his own soul; yet he does his duty, and leaves the event to God. He engaged the people in the most solemn manner to abolish idolatry, and to serve God in righteousness and true holiness. Though most were formal or hypocritical herein, yet much outward wickedness would be prevented, and they were accountable to God for their own conduct.
What abundance of wickedness in Judah and Jerusalem! One would not have believed it possible, that in Judah, where God was known, in Israel, where his name was great, in Salem, in Zion, where his dwelling-place was, such abominations should be found. Josiah had reigned eighteen years, and had himself set the people a good example, and kept up religion according to the Divine law; yet, when he came to search for idolatry, the depth and extent were very great. Both common history, and the records of God's word, teach, that all the real godliness or goodness ever found on earth, is derived from the new-creating Spirit of Jesus Christ.
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.
Upon reading these verses, we must say, Lord, though thy righteousness be as the great mountains, evident, plainly to be seen, and past dispute; yet thy judgments are a great deep, unfathomable, and past finding out. The reforming king is cut off in the midst of his usefulness, in mercy to him, that he might not see the evil coming upon his kingdom: but in wrath to his people, for his death was an inlet to their desolations.
After Josiah was laid in his grave, one trouble came on another, till, in twenty-two years, Jerusalem was destroyed. The wicked perished in great numbers, the remnant were purified, and Josiah's reformation had raised up some to join the few who were the precious seed of their future church and nation. A little time, and slender abilities, often suffice to undo the good which pious men have, for a course of years, been labouring to effect. But, blessed be God, the good work which he begins by his regenerating Spirit, cannot be done away, but withstands all changes and temptations.