isaiah 36:7 But if thou say to me, We trust in the LORD our God: is it not he, whose high places and whose altars Hezekiah hath taken away, and said to Judah and to Jerusalem, Ye shall worship before this altar? - Free Bible Online

      7. The Assyrian mistakes Hezekiah's religious reforms whereby he took away the high places (2Ki 18:4) as directed against Jehovah. Some of the high places may have been dedicated to Jehovah, but worshipped under the form of an image in violation of the second commandment: the "brazen serpent," also (broken in pieces by Hezekiah, and called Nehushtan, "a piece of brass," because it was worshipped by Israel) was originally set up by God's command. Hence the Assyrian's allegation has a specious color: you cannot look for help from Jehovah, for your king has "taken away His altars."
      to Jerusalem-- (De 12:5, 11; Joh 4:20).

JFB.