Verses 1-5: The Sign of Mahershalalhashbaz. God commands Isaiah to write the name of his son, Mahershalalhashbaz, as a prophetic symbol of the imminent plunder of Damascus and Samaria by Assyria before the child can speak.
Verses 6-8: The Coming Flood of Assyria. The Lord explains that Israel’s rejection of His gentle waters leads to the overwhelming invasion by Assyria, described as a flood reaching up to the neck, spreading across the land of Immanuel.
Verses 9-10: A Call to Nations and Futility of Opposition. Isaiah calls all peoples to unite, but their plans will fail because God is with His people.
Verses 11-15: Isaiah’s Divine Instruction and Warning. God commands Isaiah not to fear conspiracies or the people's panic but to sanctify the Lord as his fear and dread. God will be a sanctuary for some and a stumbling block for others.
Verses 16-18: Isaiah and His Children as Signs. Isaiah is told to bind the testimony and seal the law, with himself and his children serving as signs and wonders from the Lord.
Verses 19-22: Rejection of Occult Practices and Consequences. The people are warned against consulting mediums and wizards, urged instead to seek God. The chapter closes with a depiction of the people's distress, hunger, and spiritual darkness resulting from their rebellion.