Isaiah 12:1
In that day you will say:
What it says
In that day the people will thank the LORD because His anger has turned away and He has comforted them.
What it is doing
This verse opens the song with praise for wrath transformed into consolation.
In context
1In that day you will say: 2Surely God is my salvation; 3With joy you will draw water from the springs of salvation, 4and on that day you will say: 5Sing to the LORD, for He has done glorious things. 6Cry out and sing, O citizen of Zion,