What does Isaiah 26:1 mean?
Chapter 26 continues an important theme (Isaiah 24—25). Looking forward to the end times, Isaiah sees that the Lord has defeated the enemies of Israel and established Himself as king of Israel. In this time the Lord is reigning over the earth from His throne in Jerusalem. The great feast of ordination and celebration has taken place (Isaiah 25:6).He now introduces a song to be sung in the land "in that day." This phrase refers to this moment in the end times during the Messiah's reign as king over the earth. Many scholars and traditions understand Isaiah as referring to the millennial kingdom in these chapters. This song of praise to the Lord continues the metaphor of cities. In the previous two chapters, the judgment of God devastates "the city." This "world city" refers to all those opposed to the Lord. This "city" once was so imposing and seemingly unbeatable, is left a desolate ruin (Isaiah 24:9–12; Isaiah 25:2).
Now he points to a different city, the city of the Lord. This fortress for God's people will truly be unbeatable. Poetically, Isaiah declares that its defensive walls are constructed of "salvation."