Isaiah 38:1-8 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.
“This shall be the sign to you from the LORD, that the LORD will do this thing that he has promised: Behold, I will make the shadow cast by the declining sun on the dial of Ahaz turn back ten steps.” So the sun turned back on the dial the ten steps by which it had declined.
ESV: English Standard Version 2016