The Lord shall reign, &c. This concludes the whole song, by which Moses not only expresses his own faith and that of the people in God's everlasting kingdom, but promises, in the name of them all, to bear eternally in mind the signal deliverance God had wrought out for them. For ever and ever They had now seen an end of Pharaoh's reign, but time itself shall not put a period to Jehovah's reign, which, like himself, is eternal.
Related Commentaries of Exodus 15:18
Exodus 15:18-19
18 The LORD shall reign for ever and ever.
19 For the horse of Pharaoh went in with his chariots and with his horsemen into the sea, and the LORD brought again the waters of the sea upon them; but the children of Israel went on dry land in the midst of the sea.