Why would a prophecy begin with such descriptive imagery of dangerous animals and burdensome animals? It's a setup for a powerful, ironic punchline.
The opening phrase, 'An oracle on the beasts of the Negeb,' sets a tone of profound irony. The 'beasts' are not just the animals of burden, but also the dangerous wildlife of the desert they traverse. This imagery serves a dual purpose: it emphasizes the perilous nature of the journey and the land they are heading into (Egypt). Furthermore, the mention of lions, adders, and fiery serpents isn't just about geographical hazards; it serves as a symbolic representation of Egypt's own treacherous character and the dangers of their political alliance. The 'burden' carried isn't just the treasures; it's the weight of their sin and misplaced trust. The oracle is a divine commentary, highlighting the folly of their actions through vivid, almost mocking, descriptions.