2 Kings 20:5-8

20:5 “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. The day after tomorrow you will go up to the Lord’s temple. 20:6 I will add fifteen years to your life and rescue you and this city from the king of Assyria. I will shield this city for the sake of my reputation and because of my promise to David my servant.”’” 20:7 Isaiah ordered, “Get a fig cake.” So they did as he ordered and placed it on the ulcerated sore, and he recovered.

20:8 Hezekiah had said to Isaiah, “What is the confirming sign that the Lord will heal me and that I will go up to the Lord’s temple the day after tomorrow?”