en_tn_condensed/isa/46/01.md

Bel bows down, Nebo stoops low. Their idols ... for weary animals

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.

Bel ... Nebo

These were the two primary gods whom the Babylonians worshiped.