THEN Moses and the children of Israel sang this song to the Lord, and spoke, saying: “I will sing to the Lord, For He has triumphed gloriously! The horse and its rider He has thrown into the sea!” Exodus 15:1 [NKJV]
Moses, no doubt by divine inspiration, indited this song, and delivered it to the children of Israel, to be sung before they stirred from the place where they saw the Egyptians dead upon the shore.… They expressed their joy in God, and thankfulness to him by singing; it is almost natural to us thus to give vent to our joy and the exultations of our spirit.… Singing is as much the language of holy joys as praying is of holy desire.… All our joy must terminate in God, and all our praises be offered up to him, the Father of lights and Father of mercies, for he hath triumphed…
When the mercy was fresh, and they were much affected with it, then they sang this song. Note, When we have received special mercy from God, we ought to be quick and speedy in our returns of praise to him, before time and the deceitfulness of our own hearts efface the good impressions that have been made.… When they believed the Lord (14:31), then they sang this song; it was a song of faith; this connection is observed (Psalm 106:12): Then they believed his words; they sang his praise. If with the heart man believes, then confession must be made. – Matthew Henry
Spirit Filled Life Daily Devotional Bible, (Nashville: Thomas Nelson Publishers) 1998, c1993.