What does Isaiah 14:9 mean?
Isaiah's description of the aftermath of the death of the king of Babylon moves from celebrations on earth to his reception in the place of the dead, This place is referred to as Sheol.This poetic imagery isn't meant to be a precise, analytical, theologically nuanced representation of the afterlife. Instead, Isaiah pictures the place of the dead as it may have been imagined to his audience at the time of writing. The dead were thought to occupy a similar level of status in Sheol as they did during their lives on earth. He is picturing the dead kings of the nations as occupying thrones, as they did in life. Isaiah will turn that idea on its head.
This place of the dead is stirred up at the news that the evil king of Babylon will be arriving there. Sheol rouses the spirits of the dead leaders of the world to greet the fallen king. They are pictured as rising from their thrones as he enters. As if these leaders still had places of honor and authority.
Chapter 14:3–23 contains a mocking, sarcastic dirge for the fallen king of Babylon. The song imitates the respects otherwise paid to honor a fallen king. Instead, this song describes celebration of both people and trees at his death. The fallen kings in Sheol rise to mock the man for his weakness. The king is sarcastically referred to as the "Day Star"—leading to speculation that this is also a description of Satan's fall from heaven. The fallen one had ambition to become like the Most High among the gods, but instead was cut down to nothing in his death.
After the oracle against Babylon in the previous chapter, Isaiah briefly describes what will follow for Judah. In compassion, the Lord will choose His people once more. He will return them to their homeland. They will sing a mocking taunt-song against the fallen king of Babylon. Isaiah pronounces oracles from the Lord against Assyria and Philistia. The Lord will break the Assyrians in His land. With heavy symbolism, Isaiah seems to prophecy that the Assyrians will defeat the Philistines with a siege four years before it happens. God's people will find refuge in Zion.