We have here a general character of the reign of Ahaz. Few and evil were his days - few, for he died at thirty-six - evil, for we are here told, 1. That he did not that which was right like David (Kg2 16:2), that is, he had none of that concern and affection for the instituted service and worship of God for which David was celebrated. He had no love for the temple, made no conscience of his duty to God, nor had any regard to his law. Herein he was unlike David; it was his honour that he was of the house and lineage of David, and it was owing to God's ancient covenant with David that he was now upon the throne, which aggravated his wickedness; for he was a reproach to that honourable name and family, which therefore was really a reproach to him (Degeneranti genus opprobrium - A good extraction is a disgrace to him who degenerates from it), and though he enjoyed the benefit of David's piety he did not tread in the steps of it. 2. That he walked in the way of the kings of Israel (Kg2 16:3), who all worshipped the calves. He was not joined in any affinity with them, as Jehoram and Ahaziah were with the house of Ahab, but, ex mero motu - without any instigation, walked in their way. The kings of Israel pleaded policy and reasons of state for their idolatry, but Ahaz had no such pretence: in him it was the most unreasonable impolitic thing that could be. They were his enemies, and had proved enemies to themselves too by their idolatry; yet he walked in their way. 3. That he made his sons to pass through the fire, to the honour of his dunghill-deities. He burnt them, so it is expressly said of him (Ch2 28:3), burnt some of them, and perhaps made others of them (Hezekiah himself not excepted, though afterwards he was never the worse for it) to pass between two fires, or to be drawn through a flame, in token of their dedication to the idol. 4. That he did according to the abominations of the heathen whom the Lord had cast out. it was an instance of his great folly that he would be guided in his religion by those whom he saw fallen into the ditch before his eyes, and follow them; and it was an instance of his great impiety that he would conform to those usages which God had declared to be abominable to him, and set himself to write after the copy of those whom God had cast out, thus walking directly contrary to God. 5. That he sacrificed in the high places, Kg2 16:4. If his father had but had zeal enough to take them away, the debauching of his sons might have been prevented; but those that connive at sin know not what dangerous snares they lay for those that come after them. He forsook God's house, was weary of that place where, in his father's time, he had often been detained before the Lord, and performed his devotions on high hills, where he had a better prospect, and under green trees, where he had a more pleasant shade. It was a religion little worth, which was guided by fancy, not by faith.

Made his son to pass through the fire - On this passage I beg leave to refer the reader to my notes on Lev 18:21; Lev 20:2, Lev 20:14, where the subject is considered at large.

And he sacrificed and burnt incense in the high places, and on the hills,.... Which none of the kings of Judah before him ever did; for though they connived at this practice in the people, they never encouraged it by their own example; and very probably he offered sacrifices there to idols, see Ch2 28:25 whereas the people sacrificed to the true God, though at a wrong place:

and under every green tree; and which is never said of the people, and seems to confirm it, that Ahaz sacrificed to other gods, since the Heathens used to place idols under green trees, and worship them, whom the Jews imitated, Jer 2:2.

walked in the way of the kings of Israel--This is descriptive of the early part of his reign, when, like the kings of Israel, he patronized the symbolic worship of God by images but he gradually went farther into gross idolatry (Ch2 28:2).

made his son to pass through the fire-- (Kg2 23:10). The hands of the idol Moloch being red hot, the children were passed through between them, which was considered a form of lustration. There is reason to believe that, in certain circumstances, the children were burnt to death (Psa 106:37). This was strongly prohibited in the law (Lev 18:21; Lev 20:2-5; Deu 18:10), although there is no evidence that it was practised in Israel till the time of Ahaz.