What does Isaiah 24:21 mean?
In Isaiah's vision of the future, the world has ended. God has brought cataclysmic events to judge humanity for its rebellion and sinfulness against Him. The final blows were massive earthquakes which broke up the foundations of the earth (Isaiah 24:18–20). The passage so far has focused on God's wrath against physical things, such as human beings and the earth.Now, the prophet proclaims that God will also turn His righteous anger against spiritual and political forces. The language used here for the host is sometimes applied to stars in the (Nehemiah 9:6). But in this passage it clearly seems to carry another meaning: the supernatural, non-human, spiritual powers that come from heaven. This most likely refers to fallen angels, known as demons. This judgment will include both the innumerable beings in the spiritual realm and "kings of the earth," which seems to mean the ruling structures of humanity.
These human leaders and demonic powers will be punished together (Isaiah 24:22).