Isaiah 30:31

For through the voice of the LORD shall the Assyrian be beaten down, which smote with a rod.

Through the voice of the Lord the Assyrian power that smote others with a rod is beaten down. Its overthrow is not an isolated deliverance but stands as an object lesson for all time to every nation that opposes God. The lesson is that God will overthrow proud nations that set themselves against Him.

The same downfall points forward to the final judgment, when God defeats the proud. Then those who kept the truth celebrate their deliverance. At that final sifting of the nations the faithful enter His city while His voice announces the defeat of His enemies.