Isaiah 14:12–15: Fallen Shining One and Satan
Isaiah 14:12–15 is an oracle against a human ruler whose self-exaltation ends in the grave. Many Christians have also heard in its fallen shining one an echo of the devil's fall, but the passage itself never names Satan.
Isaiah 14:12–15: Why the Shining One Fell
The question assumes God sent Lucifer to hell as a punishment imposed from outside. Isaiah 14:12–15 places the cause inside the ruler himself: he said in his heart that he would climb to God's throne, and that climb is exactly what cannot stand.