Ye are my witnesses, saith Jehovah, and my servant whom I have chosen; that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me.
Ye--the Jews, to whom I have given predictions, verified by the event; and in delivering whom I have so often manifested MY power (see Isa 43:3-4; Isa 44:8). and my servant--that is, the whole Jewish people (Isa 41:8). believe--trust in. formed--before I existed none of the false gods were formed. "Formed" applies to the idols, not to God.
10. Ye are my witnesses. After having summoned the Gentiles to a contest, and after having proved that the stories which they circulated concerning their idols were false and unfounded, God now separates himself from the multitude of them, and produces his “witnesses,” that he may not be thought to be of the same class with them.
God here challenges the worshippers of idols to produce such proofs of the divinity of their false gods as even this very instance (to go no further) of the redemption of the Jews out of Babylon furnished the people of Israel with, to prove that their God is the true and living God, and he only. I.
Commenting on Isaiah 43:8-13