John Chrysostom
The one true God is consistently proclaimed by the prophets, asserting that there is no other beside Him (Is 45:5). Their message is not a denial of the Son; rather, it aims to address the frailty of the Jewish people and redirect them from the belief in various false deities.
I am the Lord, and there is no other; there is no God besides Me. I have positioned Myself as an adversary to your foes and a supporter to your allies: I revealed Myself as an opponent to those who resisted your restoration, while extending My favor to Cyrus, who obeyed Me. I am the Lord, and there is none other; there is no God besides Me. This assertion serves to remind His opponents that He is not one among many but the sole omnipotent Being. Thus, He states that they may recognize from the east to the west that there is none besides Me; I am the Lord, and there is no other. Behold, He also watches over other nations and bestows upon them great blessings, so that when they turn away from falsehood and return to His dwelling in alignment with truth, they may reach the heavenly kingdom.
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I am the Lord, and there is no other; there is no God besides Me. They were fully aware that He was God, yet they failed to grasp that He is the only God, a truth long understood by the Jews: The Lord our God, the Lord is one (Deuteronomy 6:4). They did not realize that He is the one God, not only of the Jews but of all creation: I am the Lord, and there is no other.