The story of Daniel in the Lions' Den is found in the Bible, specifically in the book of Daniel. It tells of a faithful man named Daniel who served in the court of King Darius. When jealous officials tricked the king into signing a decree that prohibited prayer to anyone but the king, Daniel continued to pray to God three times a day. As a result, Daniel was thrown into a den of lions as punishment. However, God protected him, and the lions did not harm him. The next day, the king found Daniel unharmed and was overjoyed, leading to the punishment of those who conspired against him.