He began to purge Judah - Jeremiah's first prophecies Jeremiah 2-3 appear to have been coincident with Josiah's earlier efforts to uproot idolatry, and must have greatly strengthened his hands.

For in the eighth year of his reign, while he was yet young,.... Being in the sixteenth year of his age; though Kimchi thinks it was the very year he began to reign, which was the eighth of his age; and Jarchi observes, it may be interpreted, "though he was young, he began to seek after the God of David his father"; to pray unto him, to seek after the knowledge of him, and the true manner of worshipping him, what were his will, commands, and ordinances; the Targum is,"to seek instruction or doctrine of the Lord God of David his father,''to be taught his ways, such as David his great ancestor walked in, and whom he chose to follow:

and in the twelfth year he began to purge Judah and Jerusalem from the high places, and the groves and the carved images, and the molten images; which were made in the times of Manasseh; and though removed by him when humbled, were restored in the reign of Amon. Now Josiah purged the land from these, by putting them down, and destroying them; and this he did when he was twenty years of age, having now more authority, being out of his minority, and from under guardians, and one year before Jeremiah began to prophesy, Jeremiah 1:1.

Extirpation of idolatry. In the eighth year of his reign, while he was yet a youth, being then only sixteen years old, Josiah began to seek the God of his ancestor David, and in the twelfth year of his reign he commenced to purify Judah and Jerusalem from the high places, Asherim, etc. The cleansing of the land of Judah from the numerous objects of idolatry is summarily described in 2 Chronicles 34:4 and 2 Chronicles 34:5; and thereupon there follows (2 Chronicles 34:6 and 2 Chronicles 34:7) the destruction of the idolatrous altars and images in the land of Israel, - all that it seemed necessary to say on that subject being thus mentioned at once. For that all this was not accomplished in the twelfth year is clear from the לטהר החל, "he commenced to cleanse," and is moreover attested by 2 Chronicles 34:33. The description of this destruction of the various objects of idolatry is rhetorically expressed, only carved and cast images being mentioned, besides the altars of the high places and the Asherim, without the enumeration of the different kings of idolatry which we find in 2 Kings 23:4-20. - On 2 Chronicles 34:4, cf. 2 Chronicles 31:1. ינתּציּ, they pulled down before him, i.e., under his eye, or his oversight, the altars of the Baals (these are the בּמות, 2 Chronicles 34:3); and the sun-pillars (cf. 2 Chronicles 14:4) which stood upwards, i.e., above, upon the altars, he caused to be hewn away from them (מעליהם); the Asherim (pillars and trees of Asherah) and the carved and molten images to be broken and ground (הדק, cf. 2 Chronicles 15:16), and (the dust of them) to be strewn upon the graves (of those) who had sacrificed to them. הזּבחים is connected directly with הקּברים, so that the actions of those buried in them are poetically attributed to the graves. In 2 Kings 23:6 this is said only of the ashes of the Asherah statue which was burnt, while here it is rhetorically generalized.

For in the eighth year of his reign, while he was yet {b} young, he began to seek after the God of David his father: and in the twelfth year he began to purge Judah and Jerusalem from the high places, and the groves, and the carved images, and the molten images.

(b) When he was but sixteen years old he showed himself zealous of God's glory, and at twenty years old he abolished idolatry and restored the true religion.

34:3 Young - ln the sixteenth year of his age; when he was entering into the age of temptation, and had the administration of his kingdom wholly in his own power, and none to restrain him; even then he begins to be religious in good earnest.

Margin groves

See Scofield Note: "Dt 16:21" See Scofield Note: "Jud 3:7".

2Ch 34:3-7. He Destroys Idolatry.

3. in the eighth year of his reign-This was the sixteenth year of his age, and, as the kings of Judah were considered minors till they had completed their thirteenth year, it was three years after he had attained majority. He had very early manifested the piety and excellent dispositions of his character. In the twelfth year of his reign, but the twentieth of his age, he began to take a lively interest in the purgation of his kingdom from all the monuments of idolatry which, in his father's short reign, had been erected. At a later period, his increasing zeal for securing the purity of divine worship led him to superintend the work of demolition in various parts of his dominion. The course of the narrative in this passage is somewhat different from that followed in the Book of Kings. For the historian, having made allusion to the early manifestation of Josiah's zeal, goes on with a full detail of all the measures this good king adopted for the extirpation of idolatry; whereas the author of the Book of Kings sets out with the cleansing of the temple, immediately previous to the celebration of the passover, and embraces that occasion to give a general description of Josiah's policy for freeing the land from idolatrous pollution. The exact chronological order is not followed either in Kings or Chronicles. But it is clearly recorded in both that the abolition of idolatry began in the twelfth and was completed in the eighteenth year of Josiah's reign. Notwithstanding Josiah's undoubted sincerity and zeal and the people's apparent compliance with the king's orders, he could not extinguish a strongly rooted attachment to idolatries introduced in the early part of Manasseh's reign. This latent predilection appears unmistakably developed in the subsequent reigns, and the divine decree for the removal of Judah, as well as Israel, into captivity was irrevocably passed.

34:1-33 Josiah's good reign in Judah. - As the years of infancy cannot be useful to our fellow-creatures, our earliest youth should be dedicated to God, that we may not waste any of the remaining short space of life. Happy and wise are those who seek the Lord and prepare for usefulness at an early age, when others are pursuing sinful pleasures, contracting bad habits, and forming ruinous connexions. Who can express the anguish prevented by early piety, and its blessed effects? Diligent self-examination and watchfulness will convince us of the deceitfulness and wickedness of our own hearts, and the sinfulness of our lives. We are here encouraged to humble ourselves before God, and to seek unto him, as Josiah did. And believers are here taught, not to fear death, but to welcome it, when it takes them away from the evil to come. Nothing hastens the ruin of a people, nor ripens them for it, more than their disregard of the attempts made for their reformation. Be not deceived, God is not mocked. The current and tide of affections only turns at the command of Him who raises up those that are dead in trespasses and sins. We behold peculiar loveliness, in the grace the Lord bestows on those, who in tender years seek to know and to love the Saviour. Hath Jesus, the Day-spring from on high, visited you? Can you trace your knowledge of this light and life of man, like Josiah, from your youth? Oh the unspeakable happiness of becoming acquainted with Jesus from our earliest years!