Shadrach, Meshach, and Abednego are figures from chapter 3 of the Book of Daniel in the Bible.
These three Hebrew men were thrown into a fiery furnace by King Nebuchadnezzar of Babylon, when they refused to bow down to the king’s image.
The three are preserved from harm however and the king actually sees four (!) men walking in the flames, “the fourth … like a son of God”