At that time Merodach-Baladan son of Baladan king of Babylon sent Hezekiah letters and a gift, because he had heard of Hezekiah's illness.
References for 2 Kings 20:12
Hezekiah received the messengers and showed them all that was in his storehouses--the silver, the gold, the spices and the fine oil--his armory and everything found among his treasures. There was nothing in his palace or in all his kingdom that Hezekiah did not show them.
Then Isaiah the prophet went to King Hezekiah and asked, "What did those men say, and where did they come from?" "From a distant land," Hezekiah replied. "They came from Babylon."
The prophet asked, "What did they see in your palace?" "They saw everything in my palace," Hezekiah said. "There is nothing among my treasures that I did not show them."
Then Isaiah said to Hezekiah, "Hear the word of the LORD:
The time will surely come when everything in your palace, and all that your fathers have stored up until this day, will be carried off to Babylon.1 Nothing will be left, says the LORD.
References for 2 Kings 20:17
And some of your descendants,2 your own flesh and blood, that will be born to you, will be taken away, and they will become eunuchs in the palace of the king of Babylon."3
References for 2 Kings 20:18
"The word of the LORD you have spoken is good," Hezekiah replied. For he thought, "Will there not be peace and security in my lifetime?"
As for the other events of Hezekiah's reign, all his achievements and how he made the pool4 and the tunnel5 by which he brought water into the city, are they not written in the book of the annals of the kings of Judah?
References for 2 Kings 20:20
Hezekiah rested with his fathers. And Manasseh his son succeeded him as king.