This was a punishment usual among the Chaldeans, to scorch, roast, and burn offenders with fire, Jeremiah 29:22: see /APC 1Ma 7:3. And this the king of Moab imitated, 2 Kings 3:27 Amos 2:1. This shows the hellish malice and cruelty of wicked men, especially against those that cross their pride and superstition, which was visible in the tortures Christians were put to in the ten persecutions, and in the fires which antichrist hath kindled in all his reign against the witnesses of Jesus; witness the book of "Acts and Monuments" whom they cannot allure with their gaudery, they fright with their fires and massacres, as ye see the effects of both in the verse following.
Related Commentaries of Daniel 3:6
Daniel 3:6
6 And whoso falleth not down and worshippeth shall the same hour be cast into the midst of a burning fiery furnace.