At that time, Babylon's King Merodach-baladan, Baladan's son, sent letters and a gift to Hezekiah, for he heard that he had been ill and had recovered.
References for Isaiah 39:1
Hezekiah was pleased, and he showed them his treasury—the silver and the gold, the spices and fine oil—and everything in his armory, all that was found in his storerooms. There wasn't a thing in his house or in all his realm that Hezekiah didn't show them.
Then Isaiah the prophet came to King Hezekiah and said to him, "What did these men say? Where did they come from?" Hezekiah replied, "They came to me from a distant land, from Babylon."
So Isaiah said, "What did they see in your house?" Hezekiah said, "They saw everything in my house. There was nothing in my storerooms that I didn't show them."
Isaiah said to Hezekiah, "Hear the word of the LORD of heavenly forces:
Days are coming when all that is in your house, which your ancestors have stored up until this day, will be carried to Babylon. Nothing will be left, says the LORD.
Some of your sons, your own descendants whom you fathered, will be taken to become eunuchs in the king of Babylon's palace."
Hezekiah said to Isaiah, "The LORD's word that you delivered is good," since he thought, That means there will be peace and security in my lifetime.