Matthew Henry on 2 Kings 12:1-3
The general account here given of Joash is, 1. That he reigned forty years. As he began his reign when he was very young, he might, in the course of nature, have continued much longer, for he was cut off when he was but forty-seven years old, Kg2 12:1. 2. That he did that which was right as long as Jehoiada lived to instruct him, Kg2 12:2. Many young men have come too soon to an estate - have had wealth, and power, and liberty, before they knew how to use them - and it has been of bad consequence to them; but against this danger Joash was well guarded by having such a good director as Jehoiada was, so wise, and experienced, and faithful to him, and by having so much wisdom as to hearken to h…
Read the whole note in the consoleJamieson-Fausset-Brown on 2 Kings 12:3
But the high places were not taken away--The popular fondness for the private and disorderly rites performed in the groves and recesses of hills was so inveterate that even the most powerful monarchs had been unable to accomplish their suppression; no wonder that in the early reign of a young king, and after the gross irregularities that had been allowed during the maladministration of Athaliah, the difficulty of putting an end to the superstitions associated with "the high places" was greatly increased.
Adam Clarke on 2 Kings 12:3
The high places were not taken away - Without the total destruction of these there could be no radical reform. The toleration of any species of idolatry in the land, whatever else was done in behalf of true religion, left, and in effect fostered, a seed which springing up, regenerated in time the whole infernal system. Jehoiada did not use his influence as he might have done; for as he had the king's heart and hand with him, he might have done what he pleased.
John Gill on 2 Kings 12:3
But the high places were not taken away,.... Used before the temple was built, or set up in Rehoboam's time, 1 Kings 14:23 contrary to the law of God, which required that sacrifices should only be offered in the place the Lord chose to dwell in, Deuteronomy 12:4 the people still sacrificed and burnt incense in the high places; as they had done in the times of Athaliah, and though the pure worship of God was restored at Jerusalem; and indeed this they did in all preceding reigns; nor was it in the power of the best of kings, at least they did not think it safe to attempt to remove them till Hezekiah's time; so fond were the people of them because of their antiquity and supposed sanctity, and…