Matthew Henry on 2 Chronicles 32:1-8
Here is, I. The formidable design of Sennacherib against Hezekiah's kingdom, and the vigorous attempt he made upon it. This Sennacherib was now, as Nebuchadnezzar was afterwards, the terror and scourge and great oppressor of that part of the world. He aimed to raise a boundless monarchy for himself upon the ruins of all his neighbours. His predecessor Shalmaneser had lately made himself master of the kingdom of Israel, and carried the ten tribes captives. Sennacherib thought, in like manner, to win Judah for himself. Pride and ambition put men upon grasping at universal dominion. It is observable that, just about this time, Rome, a city which afterwards came to reign more than any other had…
Read the whole note in the consoleJamieson-Fausset-Brown on 2 Chronicles 32:2
when Hezekiah saw that Sennacherib . . . was purposed to fight against Jerusalem--An account of the means taken to fortify Jerusalem against the threatened siege is given only in this passage. The polluting or filling up of wells, and the altering of the course of rivers, is an old practice that still obtains in the wars of the East. Hezekiah's plan was to cover the fountain heads, so that they might not be discovered by the enemy, and to carry the water by subterranean channels or pipes into the city--a plan which, while it would secure a constant supply to the inhabitants, would distress the besiegers, as the country all around Jerusalem was very destitute of water.
Adam Clarke on 2 Chronicles 32:2
When Hezekiah saw - This was in the fourteenth year of the reign of Hezekiah; and at first the Jewish king bought him off at the great price of three hundred talents of silver, and thirty talents of gold; and even emptied his own treasures, and spoiled the house of the Lord, to gratify the oppressive avarice of the Assyrian king. See the whole account, Kg2 18:13, etc.
John Gill on 2 Chronicles 32:2
And when Hezekiah saw that Sennacherib was come,.... Into the land of Judah, which he perceived and understood by reports brought to him: and that he was purposed to fight against Jerusalem; to besiege it and take it, if possible; this he saw was his design, by taking the fenced cities in his way, and coming forward with his forces.