Charles Ellicott Commentary Isaiah 41:23

"Declare the things that are to come hereafter, that we may know that ye are gods: yea, do good, or do evil, that we may be dismayed, and behold it together." — Isaiah 41:23 (ASV)

Do good, or do evil. —The challenge reminds us of Elijah’s on Mount Carmel (1 Kings 18:27). Can the heathen point to any good or evil fortune which, as having been predicted by this or that deity, might reasonably be thought of as his work? It is in the nature of things that every heathen looked to his gods as having sent blessings, or the reverse, but it was only Jehovah who could give the proof supplied by prediction.