John Gill Commentary Isaiah 43:11

"I, even I, am Jehovah; and besides me there is no saviour." — Isaiah 43:11 (ASV)

I, even I, am the Lord
Jehovah, the self-existing, eternal, and immutable Being; this is doubled for the confirmation of it, and to exclude all others: and besides me there is no Saviour ;
either in a temporal or spiritual sense; the gods of the Heathens could not save them out of their present troubles, and much less save them with an everlasting salvation; none but God can do this, and this is a proof that Christ is God, since none but God can be a Saviour.