25 He made answer and said, Look! I see four men loose, walking in the middle of the fire, and they are not damaged; and the form of the fourth is like a son of the gods. 26 Then Nebuchadnezzar came near the door of the burning and flaming fire: he made answer and said, Shadrach, Meshach, and Abed-nego, you servants of the Most High God, come out and come here. Then Shadrach, Meshach, and Abed-nego came out of the fire. 27 And the captains, the chiefs, and the rulers, and the king's wise men who had come together, saw these men, over whose bodies the fire had no power, and not a hair of their heads was burned, and their coats were not changed, and there was no smell of fire about them.

28 Nebuchadnezzar made answer and said, Praise be to the God of Shadrach, Meshach, and Abed-nego, who has sent his angel and kept his servants safe who had faith in him, and who put the king's word on one side and gave up their bodies to the fire, so that they might not be servants or worshippers of any other god but their God. 29 And it is my decision that any people, nation, or language saying evil against the God of Shadrach, Meshach, and Abed-nego, will be cut to bits and their houses made waste: because there is no other god who is able to give salvation such as this.

Matthew Henry's Commentary on Daniel 3:25-29

Commentary on Daniel 3:19-27

(Read Daniel 3:19-27)

Let Nebuchadnezzar heat his furnace as hot as he can, a few minutes will finish the torment of those cast into it; but hell-fire tortures, and yet does not kill. Those who worshipped the beast and his image, have no rest, no pause, no moment free from pain, Hebrews 12:29. Could we but see into the eternal world, we should behold the persecuted believer safe from the malice of his foes, while they are exposed to the wrath of God, and tormented in unquenchable fires.

Commentary on Daniel 3:28-30

(Read Daniel 3:28-30)

What God did for these his servants, would help to keep the Jews to their religion while in captivity, and to cure them of idolatry. The miracle brought deep convictions on Nebuchadnezzar. But no abiding change then took place in his conduct. He who preserved these pious Jews in the fiery furnace, is able to uphold us in the hour of temptation, and to keep us from falling into sin.