John Gills Exposition of the Bible Commentary - Daniel 3:25
He answered and said, lo, I see four men loose ,.... Not bound as the three were, when cast in; but quite at liberty in their hands and feet, and separate from one another. As this fiery furnace may be an emblem of the fiery trials and afflictive dispensations the children of God pass through in this world, being not joyous, but grievous to the flesh, though useful to purge and purify; so this and some other circumstances attending these good men in the furnace are applicable to the saints... read more
Matthew Henry's Complete Commentary - Daniel 3:19-27
In these verses we have, I. The casting of these three faithful servants of God into the fiery furnace. Nebuchadnezzar had himself known and owned so much of the true God that, one would have thought, though his pride and vanity induced him to make this golden image, and set it up to be worshipped, yet what these young men now said (whom he had formerly found to be wiser than all his wise men) would revive his convictions, and at least engage him to excuse them; but it proved quite otherwise.... read more