These verses may constitute an original separate oracle that Isaiah added to the preceding one, since it forms a fitting climax to his thought. Alternatively, the title "oracle" (lit. burden) may be wordplay with the objects of this prophetic message, the burden-bearers (beasts) of the Judean ambassadors. The title is very similar to those in Isaiah 21:1; Isaiah 21:11, and Isaiah 22:1. [source][source][source]
Rather than going directly to Egypt through Philistia, the Judean ambassadors had taken the circuitous and dangerous route through the Negev, probably to avoid Assyrian detection. They had taken roughly the same route as their ancestors who left Egypt in the Exodus , only traveling in the opposite direction (cf. Numbers 21:6; Deuteronomy 8:15). This irony highlights the folly of returning to Egypt for help. The Lord expressed more concern for the animals that carried the ambassadors, than for the ambassadors themselves, since the ambassadors were rebelling against Him. [source][source][source]
"A caravan loaded with treasure struggles through wild terrain infested with lions and snakes, all to buy the help of an old dragon who is in fact helpless. All the cost in effort and wealth will come to nothing, says the prophet." [1][source]