Isaiah speaks of people placing the idols of Bel and Nebo into a cart for animals to transport as if these gods were made to "bow down" and "stoop." These are both postures of humiliation. (See: [[rc://en/ta/man/translate/figs-metaphor]])
# Bel ... Nebo
These were the two primary gods whom the Babylonians worshiped. (See: [[rc://en/ta/man/translate/translate-names]])
# their idols
the idols that represented Bel and Nebo
# they cannot rescue the images
"Bel and Nebo cannot rescue their images"
# they themselves have gone off into captivity
Isaiah speaks of people carrying off these idols as if the false gods whom they represent are being carried off to captivity. (See: [[rc://en/ta/man/translate/figs-metaphor]])