Isaiah 39 (parallel to 2 Kings 20:12-19) closes the historical bridge and turns the book toward Babylon. Merodach-baladan, a Chaldean prince who repeatedly rebelled against Assyria, "sent letters and a present to Hezekiah, for he heard that he had been sick, and had recovered." 2 Chronicles 32:31 adds that God left Hezekiah to test him, to know all that was in his heart.
Hezekiah "was pleased with them, and showed them the house of his precious things." The text stresses completeness: "There was nothing in his house, nor in all his dominion, that Hezekiah didn't show them." After trusting God so fully in chapter 37, he now displays human wealth and military strength to a foreign power.
Isaiah's questions expose the problem, and the prophecy reverses it: "Behold, the days are coming when all that is in your house, and that which your fathers have stored up until today, will be carried to Babylon. Nothing will be left." This was fulfilled about a century later (2 Kings 24-25). Hezekiah answers, "Yahweh's word which you have spoken is good." He adds, "For there will be peace and truth in my days." His response may show humble acceptance or a narrow concern for his own time; the text leaves it open. The next chapter begins with a call to comfort God's people.