Babylon enters the story before Babylon takes Jerusalem
After Hezekiah's illness, Babylonian envoys came to him. Hezekiah showed them his treasures and armory. Isaiah then announced that the day would come when what had been stored in his house would be carried to Babylon.
Keep the recorded details separate
SCRIPTURE: 2 Kings 20 and Isaiah 38–39 connect Hezekiah's illness, the sign involving the shadow on the steps or dial of Ahaz, the Babylonian visitors, the treasures shown to them, and Isaiah's warning.
RESEARCH METHOD: the study does not need to invent a motive for Hezekiah. It follows the recorded visit and preserves Isaiah's Babylon warning for the later captivity story.
Why the connection matters
At this point Assyria dominates the immediate crisis, but Babylon has entered the narrative. Later, when Judah's treasures and people are carried away, the reader can recognize that Babylon did not first appear at Jerusalem's destruction.