עמוס, פרק א׳, פסוק ז׳

The judgment against Gaza arrives in the form of absolute military devastation. Even though the city fortified itself behind a strong wall, the divine decree dictates that these defenses will be breached and the entire city will be handed over to the flames [מלבי״ם]. This fire serves as a metaphor for a fierce enemy army that God will unleash against the city [אבן עזרא, אברבנאל].

The assault will begin at the outer wall, but the destruction will not stop at the perimeter. The invading forces will sweep inward, completely burning down the city's large homes, castles, inner fortresses, and beautiful palaces [אברבנאל, ביאור שטיינזלץ]. Ultimately, this represents the total collapse of Gaza at the hands of its enemies. This downfall is not an isolated event, but rather one piece of a much broader decree of judgment directed at the rest of the Philistine cities [אברבנאל, ביאור שטיינזלץ].