This chapter Isaiah 12:1-6 is a part of the vision which was commenced in Isaiah 10:5. The prophet had foretold the deliverance of the nation from the threatened invasion of Sennacherib Isaiah 10; he had then looked forward to the times of the Messiah, and described the certainty, the character, and the consequences of this reign Isaiah 11. The eleventh chapter closes with a reference to the deliverance of the nation from the oppression of the Egyptians. That deliverance was celebrated with a beautiful ode, which was sung by Miriam and ‘all the women,’ who ‘went out after her with timbrels and with dances’ Exodus 15:1-21. In imitation of that deliverance, Isaiah says, in this chapter, that the deliverance of which he speaks shall be celebrated also with a song of praise; and this chapter; therefore, is properly an expression of the feelings office redeemed people of God, in view of his great mercy in interposing to save them.
It should be read in view of the great and glorious deliverance which God has performed for us in the redemption of his Son; and with feelings of lofty gratitude that he has brought us from worse than Egyptian bondage - the bondage of sin. The song is far better applied to the times of the Messiah, than it could be to anything which occurred under the Jewish dispensation. The Jews themselves appear to have applied it to his time. On the last day of the feast of tabernacles, they brought water in a golden pitcher from the fountain of Siloam, and poured it, mingled with wine, on the sacrifice that was on the altar, with great rejoicing (see the notes at John 7:14, notes at John 7:37). This custom was not required by Moses, and probably arose from the command in Isaiah 12:3 of this chapter. Our Saviour applied it to himself, to the benefits of his gospel, and to the influences of the Spirit John 7; and the ancient Jews so applied it also. ‘Why is it called the house of drawing? Because from thence they draw the Holy Spirit; as it is written, “and ye shall draw water with joy from the fountains of salvation.”’ - (“Jerusalem Talmud” as quoted by Lowth.)