In that day: i.e. in the yet future day, when these judgments shall have been accomplished.
Judah. In Isaiah 2. we have the Song of Judah (Isaiah 26:1); in Isaiah 27, the Song of Israel. Compare verses: Isaiah 26:6; Isaiah 26:12.
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.