Isaiah 38:1-6 ESV
In those days Hezekiah became sick and was at the point of death. And Isaiah the prophet the son of Amoz came to him, and said to him, “Thus says the LORD: Set your house in order, for you shall die, you shall not recover.” Then Hezekiah turned his face to the wall and prayed to the LORD, and said, “Please, O LORD, remember how I have walked before you in faithfulness and with a whole heart, and have done what is good in your sight.” And Hezekiah wept bitterly.
Then the word of the LORD came to Isaiah: “Go and say to Hezekiah, Thus says the LORD, the God of David your father: I have heard your prayer; I have seen your tears. Behold, I will add fifteen years to your life. I will deliver you and this city out of the hand of the king of Assyria, and will defend this city.
ESV: English Standard Version 2016