Sforno on Exodus 15:2/ספורנו על שמות ט״ו:ב׳

1עזי וזמרת י-ה, It is G’d’s glory that He flung Pharaoh’s might into the Sea. By doing this He demonstrated that He is the King of kings, and that it is appropriate that those who have been saved by Him praise Him in poem and song. They should demonstrate their joy at having been elevated to being servants of the true master, the King of the universe.

2ויהי לי לישועה, my salvation consisted in the fact that He flung the enemy into the Sea. (compare Isaiah 66,14 “The power of the Lord will be revealed on behalf of His servants; but He shall rage against His foes.”)

3זה א-לי, He is the eternal original Being as far as I am concerned. He invented or called into existence all perishable phenomena. Any and all phenomena which will endure have been enabled to do so only by His will.

4ואנוהו, I will erect a suitable residence for Him in our midst. Within that residence I shall pray to Him exclusively and I will serve Him as is befitting to the One Who bestows both goodness and punishes the derelict. (compare Isaiah 44,17. ויתפלל אליו ויאמר הצילני נא כי א-לי אתה, “He prayed to Him, saying: ‘save me for You are my G’d.’”) Both prayer and service (sacrifices, etc.) have as their purpose to find favour in the eyes of the Lord.

5אלוקי אבי, a reference to the “G’d of Yaakov” who had spoken of א-ל אלוקי ישראל, in Genesis 33,20. Yaakov had meant that G’d is great in His awesomeness, His supervision of the individual fates of His creatures. He had named G’d thus to indicate that G’d combines within Himself both the attribute of love and the attribute of Justice.

6וארוממנהו, I elevate Him by my prostrating myself and humbling myself before Him, as well as by making it known that the purpose of everyone of my endeavours in this life to carry out His will to the best of my ability, consistent with the intellectual faculties granted to me. I acknowledge that His will is always superior and ultimately of the most benefit to His creatures. This is why in the final analysis He is beyond even our best efforts to praise Him and exalt Him. (Nechemyah 9,6).