The Book of 2 Kings
2 Kings 20
Some time later Hezekiah became deathly sick. The prophet Isaiah son of Amoz paid him a visit and said, “Put your affairs in order; you’re about to die—you haven’t long to live.”
2 Kings 20:1 MSG
On hearing this 
Hezekiah wept & prayed to God to heal him as he reminded him of his faithfulness & devotion towards him 
As Isaiah was walking away he got a message from God for the King……
“Go back and tell Hezekiah, the leader of my people, ‘This is what the Lord God of your ancestor David says: I have heard your prayer; I have seen your tears. Look, I will heal you. On the third day from now you will go up to the Lord ’s temple. I will add fifteen years to your life. I will rescue you and this city from the grasp of the king of Assyria. I will defend this city for my sake and for the sake of my servant David.’”
2 Kings 20:5-6 CSB
After healing, Hezekiah received a delegation from Babylon & he showed them everything in his palace & kingdom. After showing them everything, God sent Prophet Isaiah with a message for the …..
The time is coming when everything in your palace—all the treasures stored up by your ancestors until now—will be carried off to Babylon. Nothing will be left, says the Lord . Some of your very own sons will be taken away into exile. They will become eunuchs who will serve in the palace of Babylon’s king.”
2 Kings 20:17-18 NLT