Probably a part of a sarcophagus, the three Hebrew youngsters that were thrown into a furnace and survived, limestone, Çapa, Istanbul. 4th-5th century AD. From the Wikipedia: The story is well-known among Jews and Christians. In the story, Hananiah (Shadrach), Mishael (Meshach), and Azariah (Abednego), defy King Nebuchadnezzar's order that they bow down and worship a golden idol, a cult image of Nebuchadnezzar. Nebuchadnezzar, in a rage, orders the boys thrown into a furnace, but they are miraculously unharmed by the flames and survive the experience unscathed. Nebuchadnezzar sees them walking around in the furnace along with an unnamed angel. After the three youths emerge, Nebuchadnezzar gives a command that anyone who speaks against the God of Shadrach, Mesahach, and Abednego will be torn apart and have his house turned into a pile of stones.
The Septuagint version of this story adds two additional portions to the story that take place while the three youths are inside the furnace. In the "Prayer of Azariah", Azariah confesses their sins and the sins of Israel, and asks their God to save them to demonstrate his power to the Babylonians. It is followed by an account of an angel coming and making the inside of the furnace feel like a cool breeze over dew, and an extended hymn of praise to their God for delivering them, the "Song of the Three Young Men".