John Calvin on Exodus 12:12-13

12. For I will pass through the land. This refers to the first passover, the night in which they were to be delivered from Egypt; and God expressly declares that He will be the judge against the false gods, because it then especially appeared how utterly unable they were to help, and how vain and fallacious was their service. The absurd commentary of some of the Rabbins C. found in S. M. that Onkelos and the Rabbis said the Egyptian idols were laid prostrate. — W. is tame and far-fetched, that the idols should be cast down, because by the single miracle of their redemption, all superstitions were magnificently overturned, and whatsoever men believed about idols was condemned as folly and delusion. God therefore affirms, that he would not only conquer the nation itself, but its very gods. Perhaps Isaiah alludes to this passage when he says,

“Behold, the Lord rideth upon a swift cloud, and shall come into Egypt; and the idols of Egypt shall be moved at his presence,” (Isaiah 19:1;)

for wherever He has appeared as the Savior of His people, He has asserted His glory in opposition to all impious and corrupt religions.