Tell us what is to come hereafter, that we may know that you are gods; do good, or do harm, that we may be dismayed and terrified.
23. Do good, or do evil. It must not be supposed that to do evil denotes, in this passage, to commit injustice, which is contrary to the nature of God; but it means to inflict punishment, and to send adversity, which ought to be ascribed to the providence of God, and not to idols or fortune. In this sense it is very frequently found in Scripture.
The Lord, by the prophet, here repeats the challenge to idolaters to make out the pretentions of their idols: "Produce your cause (Isa 41:21) and make your best of it; bring forth the strongest reasons you have to prove that your idols are gods, and worthy of your adoration." Note, There needs no more to show the absurdity of sin than to produce the reasons...
Commenting on Isaiah 41:21-29
Show the things that are to come hereafter,.... From henceforward to the consummation of all things: so the Targum, "show what shall come to the end;'' or at the end, the end of all things; or show wonderful things, which shall be hereafter; so Jarchi interprets the word; a word like this having the signification of signs and wonders: that we may know that ye...