They are worthless, a work of delusion; at the time of their punishment they shall perish.
He confirms the same thing. What he called before falsehood, שקר, shikor, he calls now vanity, הבל ebel. They are vanity, he says. He had said that they were falsehood, which means, that men were grossly deceived when they sought the presence of God in dead things, now he says, that they were vanity, and also the work of illusions; but some render the last...
The prophet Isaiah, when he prophesied of the captivity in Babylon, added warnings against idolatry and largely exposed the sottishness of idolaters, not only because the temptations in Babylon would be in danger of drawing the Jews there to idolatry, but because the afflictions in Babylon were designed to cure them of their idolatry.
Commenting on Jeremiah 10:1-16
They are vanity,.... They are the fruit of the vain imagination of men; to worship them shows the vanity of the human mind; and they are vain things to trust to: and the work of errors; of erroneous men, and which lead men into errors; and are worthy to be laughed at, as the Targum paraphrases it.