וַיֹּ֗אמֶר כִּֽי־יָד֙ עַל־כֵּ֣ס יָ֔הּ מִלְחָמָ֥ה לַיהוָ֖ה בַּֽעֲמָלֵ֑ק מִדֹּ֖ר דֹּֽר׃ (פ)
At sinabi niya: “Sapagkat ang kamay ay nasa trono ng Walang-Hanggan: may digmaan ang Walang-Hanggan laban sa Amalek mula sa salinlahi hanggang sa salinlahi.”
Chizkuni
כי יד על כס יה, “for as long Israel will possess the power to appoint to sit on the throne of G-d;” we know of a similar though strangely sounding formulation, from Chronicles I 29,23: וישב שלמה על כסא ה' למלך תחת דוד אביר“Solomon successfully took over the throne of the Lord as king instead of his father David.” The verse describes conditions when it will be possible to wage G-d’s war against Amalek.
Da'at Zekenim
ויאמר כי יד על כס י-ה, he (Moses) said: “as soon as G–d’s hand on His throne will become firmly established throughout His universe, He will go to war against Amalek. The word יד describing an active monarchy is found in Samuel I 15,12,. I have heard in the name of Rabbi Aaron Halevi of blessed memory who questioned that the subject of the word יד here is Amalek, seeing that it says: ”I will surely wipe out.” How could Amalek have said this of himself? On the other hand in Deuteronomy 25,19, Moses commands the people in the name of the Lord that once the time has come when there is no more antisemitism, instead of letting bygones be bygones, the Jewish people are charged with seeing to it that even the mention of the name Amalek will be eradicated once and for all. Personally, I do not see a problem there at all. In our portion we discuss times when Amalek raises its hand against Israel. At such a time we need G–d to defend us against him. In Deuteronomy, it is presumed Amalek is raising his sword against the Temple, G–d’s home on earth. When the residence of the Lord is in danger, it is G–d’s people, we, who have to rise up in its defense. Jerusalem is called the throne of G–d. His throne is not secure as long as there is still any descendant of Amalek alive on this earth. We read in Psalms 9,8: וה' לעולם ישב כונן למשפט כסאו, “but the Lord abides forever; He has set up His throne for judgment.” This is the reason why the dead are unable to praise the Lord (Psalms 115,17) seeing that being dead they cannot battle Amalek. This is why David continues in Psalm 118 with: לא אמות כי אחיה ואספר מעשי ה' וגו', “I do not wish to die, as I want to be able to tell of the great deeds of the Lord, etc.”