Here is, I. Ahaz abusing the temple, not the building itself, but some of the furniture of it. 1. He defaced the bases on which the lavers were set (Kg1 7:28, Kg1 7:29) and took down the molten sea, Kg2 16:17. These the priests used for washing; against them therefore he seems to have had a particular spite. It is one of the greatest prejudices that can be done to religion to obstruct the purifying of the priests, the Lord's ministers. 2. He removed the covert for the sabbath, erected either in honour of the sabbath or for the conveniency of the priests, when, on the sabbath, they officiated in greater numbers than on other days. Whatever it was, it should seem that in removing it he intended to put a contempt upon the sabbath, and so to open as wide an inlet as any to all manner of impiety. 3. The king's entry, which led to the house of the Lord, for the convenience of the royal family (perhaps that ascent which Solomon had made, and which the queen of Sheba admired, Kg1 10:5), he turned another way, to show that he did not intend to frequent the house of the Lord any more. This he did for the king of Assyria, to oblige him, who perhaps returned his visit, and found fault with this entry, as an inconvenience and disparagement to his palace. When those that have had a ready passage to the house of the Lord, to please their neighbours, turn it another way, they are going down the hill apace towards their ruin.
II. Ahaz resigning his life in the midst of his days, at thirty-six years of age (Kg2 16:19) and leaving his kingdom to a better man, Hezekiah his son (Kg2 16:20), who proved as much a friend to the temple as he had been an enemy to it. Perhaps this very son he had made to pass through the fire, and thereby dedicated him to Moloch; but God, by his grace, snatched him as a brand out of the burning.

And the covert for the Sabbath - There are a great number of conjectures concerning this covert, or, as it is in the Hebrew, the מוסך musach, of the Sabbath. As the word, and others derived from the same root, signify covering or booths, it is very likely that this means either a sort of canopy which was erected on the Sabbath days for the accommodation of the people who came to worship, and which Ahaz took away to discourage them from that worship; or a canopy under which the king and his family reposed themselves, and which he transported to some other place to accommodate the king of Assyria when he visited him. Jarchi supposes that it was a sort of covert way that the kings of Judah had to the temple, and Ahaz had it removed lest the king of Assyria, going by that way, and seeing the sacred vessels, should covet them. If that way had been open, he might have gone by it into the temple, and have seen the sacred vessels, and so have asked them from a man who was in no condition to refuse them, however unwilling he might be to give them up. The removing of this, whatever it was, whether throne or canopy, or covered way, cut off the communication between the king's house and the temple; and the king of Assyria would not attempt to go into that sacred place by that other passage to which the priests alone had access.

Now the rest of the acts of Ahaz which he did, are they not written in the book of the chronicles of the kings of Judah? Some others are written in the canonical book of Chronicles, Ch2 28:1 and were, it is highly probable, in the annals of the kings of Judah, now lost.
2 Kings 16:20

the covert for the Sabbath--the portico through which the priests entered the temple on the Sabbath.

the king's entry without--a private external entrance for the king into the temple. The change made by Ahaz consisted in removing both of these into the temple from fear of the king of Assyria, that, in case of a siege, he might secure the entrance of the temple from him.

Next: 2 Kings Chapter 17