2 Kings 20:3-13

3 "Please, LORD, remember how I've lived faithfully and sincerely in your presence. I've done what you consider right." And he cried bitterly.
4 Isaiah hadn't gone as far as the middle courtyard when the LORD spoke his word to him:
5 "Go back and say to Hezekiah, leader of my people, 'This is what the LORD God of your ancestor David says: I've heard your prayer. I've seen your tears. Now I'm going to heal you. The day after tomorrow you will go to the LORD's temple.
6 I'll give you 15 more years to live. I'll rescue you and defend this city from the control of the king of Assyria for my sake and for the sake of my servant David.'"
7 Then Isaiah said, "Get a fig cake, and put it on the boil so that the king will get well."
8 Hezekiah asked Isaiah, "What is the sign that the LORD will heal me and that I'll go to the LORD's temple the day after tomorrow?"
9 Isaiah said, "This is your sign from the LORD that he will do what he promises. Do you want the shadow to go forward ten steps or come back ten steps?"
10 Hezekiah replied, "It's easy for the shadow to extend ten [more] steps forward. No, let it come back ten steps."
11 Then the prophet Isaiah called on the LORD, and the LORD made the shadow that had gone down on Ahaz's stairway go back up ten steps.
12 At that time Baladan's son, King Merodach Baladan of Babylon, sent letters and a present to Hezekiah because he heard that Hezekiah had been sick.
13 Hezekiah was so happy with them that he showed the messengers his warehouse: the silver, gold, balsam, fine olive oil, his entire armory, and everything in his treasury. Hezekiah showed them everything in his palace and every corner of his kingdom.