Shadrach, Mesach and Abednego were spared from the fiery furnace by the LORD. They had been cast into the flames for not worshiping Babylonian gods and enraged the king for their stubborn refusal to comply even under the threat of death.
Their deliverance from the flames earned them a pardon from the king and choice appointments at court.
The depiction of this miracle appears early in Christian art, including in the Roman catacombs. This mosaic is a 20th century in Westminster Cathedral.