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."