The three youths in the furnace
One of the episodes from the life and visions of the Old Testament Prophet Daniel in which the story of the Shadrak, Mishak, and Abednego in the fiery furnace is described (Dn 3).
The Babylonian king, Nebuchadnezzer, had a golden idol made up and ordered that, for the official unveiling of the statue, the invited councilors, judges, governors, and administrators of his kingdom should throw themselves down before it. Otherwise he threatened to send those who refused to cooperate to death by fire.
From among the summoned guests, three Jewish administrators from the region of Babel declared to the king that they did not want to subject themselves to this ceremony. The furious Nebuchadnezzer then decided to punish the three men, so he had the furnace fired up seven times hotter than usual, in order to abandon the three there to the fire. However, although the servants charged with stoking the furnace were themselves burned up by the flames, the fire was not able to harm the three faithful Jews. The king himself witnessed this wonder, in which he perceived four figures, instead of three, in the blaxing furnace. He let them go free and rewarded them by making them high officials in his kingdom.
The west side of the capital shows the fourth figure, an angel, above the three youths in the furnace, next to one of the servants, who fans the flames of the fire, king Nebuchadnezzer, and the golden idol itself.