Isaiah 39:1
At that time Merodach–baladan, the son of Baladan, king of Babylon, sent letters and a present to Hezekiah: for he had heard that he had been sick, and was recovered.
Cross-reference
Isaiah 13:1 introduces the oracle against Babylon, the nation that appears here in the envoy visit—linking history to later prophecy.
Isaiah 13:19 foretells Babylon's destruction—the same nation whose envoys visit here, foreshadowing its downfall.
Isaiah 14:4 contains a taunt against the king of Babylon, whose predecessor sent envoys here—connecting the visit to prophetic judgment.
2 Kings 20:12-19 is the parallel account of the same Babylonian envoy visit to Hezekiah, providing additional details.
2 Chronicles 32:31 adds that the Babylonian envoys came to ask about the miraculous sign, not just because of Hezekiah's sickness.
Jeremiah 50:2 prophesies Babylon's future downfall, contrasting with its apparent power when sending envoys to Hezekiah.