In that day — When God shall do such glorious works, as are described in the foregoing chapter. Sung — In the church of God. A city — Jerusalem, or the church, which is often compared to a city. For walls — God's immediate and saving protection shall be to his church instead of walls.
Related Commentaries of Isaiah 26:1
Isaiah 26:1
1 In that day shall this song be sung in the land of Judah; We have a strong city; salvation will God appoint for walls and bulwarks.