They decorate it with silver and gold; they fasten it with hammer and nails so that it cannot move.
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 deck it with silver and with gold,.... Cover it with plates of silver and gold, for the sake of ornament, that it may look grand, majestic, and venerable; and by this means draw the eye and attention, and so the devotion of people to it: they fasten it with nails and hammers, that it move not.
fasten . . . move not--that is, that it may stand upright without risk of falling, which the god (!) would do, if left to itself (Isa 41:7).