Verses 1-5: The Siege and Divine Intervention. The chapter opens with the announcement of the Day of the LORD, describing a siege on Jerusalem by all nations and God's direct intervention through a miraculous event involving the Mount of Olives.
Verses 6-11: The Unique Day and Restoration of Jerusalem. These verses describe the nature of that day as neither day nor night, the flowing of living waters from Jerusalem, and the transformation of the land surrounding the city, emphasizing safety and divine kingship.
Verses 12-15: Judgment on the Nations. God’s judgment is depicted as a devastating plague upon those who fought against Jerusalem, affecting both people and animals.
Verses 16-19: Universal Worship and Consequences for Disobedience. The surviving nations are called to yearly worship of the LORD in Jerusalem, with severe consequences for those who refuse.
Verses 20-21: Holiness and Purity in Worship. The chapter closes with a depiction of holiness permeating even the everyday objects used in worship, and the removal of idolatrous influences from the temple.