1. The thanksgiving that now follows is the counterpart of the hymn of praise sung after the passage of the Red Sea (Exodus 15), and is partly based upon it. Some scholars doubt its Isaianic authorship and date it after the return from exile.
Related Commentaries of Isaiah 12:1
Isaiah 12:1-6
1 And in that day thou shalt say, O LORD, I will praise thee: though thou wast angry with me, thine anger is turned away, and thou comfortedst me.
2 Behold, God is my salvation; I will trust, and not be afraid: for the LORD JEHOVAH is my strength and my song; he also is become my salvation.
3 Therefore with joy shall ye draw water out of the wells of salvation.
4 And in that day shall ye say, Praise the LORD, calla upon his name, declare his doings among the people, make mention that his name is exalted.
5 Sing unto the LORD; for he hath done excellent things: this is known in all the earth.
6 Cry out and shout, thou inhabitantb of Zion: for great is the Holy One of Israel in the midst of thee.