Albert Barnes Commentary Isaiah 43:26

"Put me in remembrance; let us plead together: set thou forth [thy cause], that thou mayest be justified." — Isaiah 43:26 (ASV)

Put me in remembrance - That is, urge all the arguments in your own defense that you can. State everything in self-vindication that can be stated.

The language here is taken from the practice of courts when a cause is on trial, and God urges them, on their part, to present everything they can in self-vindication.

On His part, He alleged that the princes and rulers of the nation had sinned (Isaiah 43:27), that the whole nation had transgressed (Isaiah 43:23–24), and that for this they were justly punished (Isaiah 43:28). Here He urges them to advance all in self-defense that they could—if they could pretend that He had forgotten anything, that they had merits He had not considered, or that He had charged them with crime with undue severity.

Let us plead together - Hebrew, ‘Let us be judged together’ (see the note at Isaiah 41:1).

Declare you, that you may be justified - That you may show that you are just, or righteous; that you may demonstrate that you are unjustly accused of crime, and punished with undue severity.