Comentario citado sobre Isaías 45:17

עזי וזמרת י-ה, “G’d’s might and vengeance was my salvation.” When Moses referred to G’d by the term עזי, he paraphrased what is written in Psalms 68,29: צוך אלו-היך עזך, “your G’d has ordained might for you.” The words זמרת י-ה are related to Samuel II 23,1 ונעים זמירות ישראל, “the favorite of the songs of Israel.” This term also occurs in Psalms, 47,7 זמרו לאלו-הים זמרו, “Sing, O sing to G’d; O sing.”
ויהי לי לישועה, “G’d became my salvation.” The reason the redemption from Egypt is always referred to as ישועה, is because it was followed by another exile. The redemption of the future which will not be followed by another exile, will become known as ישועות, (plural). This is why we have David (Psalms 53,7) express his hope for מי יתן מציון ישועות ישראל, “O that the deliverance of Israel might come from Zion!” On another occasion the final redemption is called תשועת עולמים, in Isaiah 45,17: ישראל נושע בה' תשועת עולמים, “But Israel has won through the Lord triumph everlasting.” In a parallel sense the “song” Moses sang at the Sea of Reeds is known as שירה, “a song (feminine),” whereas the song that will be sung after the final redemption will be known as שיר, “a song (masculine),” reflecting the permanent nature of that redemption; compare Isaiah 26,1 ביום ההוא יושר השיר הזה,”On that day this song which will be sung will be masculine.”

I HOPE FOR THY AID, O ETERNAL. Among all the judges of Israel there was none who fell into the hands of his enemies except Samson, who is this “snake” [referred to in Jacob’s prophecy], just as it is written, Then the Eternal was with the judge, and saved them out of the hand of their enemies all the days of the judge,¹⁹⁹Ibid., 2:18. and Samson was the last of the judges since his successor Samuel was a prophet and he did not conduct war on the people’s behalf, and in his days the kings [Saul and David] reigned. Now when the prophet Jacob saw that the deliverance which was to come through Samson ceased [when he died together with the Philistines], he said, “I hope for Thy aid, O Eternal, not for the aid of ‘the snake’ or ‘the serpent,’ for it is by Thee that I will be helped, not by a judge, as Thy salvation is ‘an everlasting salvation.’”²⁰⁰See Isaiah 45:17.

אשריך ישראל מי כמוך, “Hail to you, Israel;” this verse is an explicit promise to the Jewish people concerning life in the hereafter. Seeing that in the previous verse Moses had discussed the destination(s) of the body i.e. what is good for the body, such as the blessings bestowed on earth, abundant crops, conditions of secure tenure of the land, such as a land with ample supplies of grain and wine, a land benefiting from the beneficial dews descending from the skies, and even the promise that should the people ever be exiled, no conquering nation would ever feel at home in their land, now Moses addresses his attention to matters of benefit to the soul.
We know about this already from Bileam’s blessing in Numbers 23,9: “they are a nation which dwells in solitary splendor,” הן עם לבדד ישכון; Moses now takes up this theme when he refers to Israel being בדד. (verse 28) He is at pains to point out that the rosy future of the Jewish people comprises more than a secure and worry-free existence in Eretz Yisrael, accompanied by an abundance of material blessings. This is why he introduces the subject by describing a unique feature of the Jewish people, i.e. “hail to you Israel, who is like you?” He means that whereas all the other nations, at best, can look forward to a worry-free life of plenty on terrestrial earth, Israel will experience an additional dimension of life in the celestial spheres. This is the meaning of the words עם נושע בה' תשועת עולמים, “a nation delivered by Hashem Who extends His deliverance into 2 worlds” [עולמים, pl. Ed.]. A true deliverance must include life in the world to come, or it is by definition not a true deliverance. [One may understand the words “true deliverance” as a deliverance from the initial curse that came on upon mankind, i.e. death, when Adam ate from the tree of knowledge. Every “true” deliverance should free one from that. Ed.]
After having told the people that there would indeed be a reward for keeping the Torah in the world to come, Moses proceeds to offer the Jewish people proof of this in the form of a miracle. He tells the people that G’d Himself would be their shield, that they would be able to boast about G’d being their “sword,” מגן עזרך. This promise includes the attribute of Justice, even. The word מגן, shield, is an allusion to the attribute of Justice, seeing a shield is generally worn on the left, and the attribute of Justice is perceived as on the left side of the diagram of the emanations. David also speaks of G’d being Israel’s shield in Psalms 18,36, when he said: ותתן לי מגן ישעך, “You gave me the shield of Your protection.” He elaborates further in Psalms 84,12, saying: כי שמש ומגן ה' אלו-הים, “for the Lord is both sun and shield.” In that verse David refers to the tetragrammaton, Hashem, as “sun,” and to the attribute of Justice, אלו-הים, as “shield.” Moses reassures the people that constant military success on earth against all their enemies is proof that they have a future in the very regions from which this success emanates, is orchestrated on their behalf by G’d.
You may consider it a rule that all the various promises to the people of Israel as a whole, such as at the beginning of the portion Bechukotai, do not concern them themselves merely with the promise of reward in this finite world of ours. They are all similes for the kind of reward awaiting us in celestial regions after the death of our bodies. The success promised by the Torah in our terrestrial world is only to be viewed as proof of the far greater reward in store for us (if we keep the commandments) in a far better world than the terrestrial globe on which we have been born. It is most appropriate that the King of Israel, Moses, on the day when he himself readied himself for entry into that better world, tells his charges that he blessed them in this fashion, that all of them could look forward to that kind of a future.