2 Kings 20:5-8

5“Go back and tell Hezekiah the leader of My people that this is what the LORD, the God of your father David, says: ‘I have heard your prayer; I have seen your tears. I will surely heal you. On the third day from now you will go up to the house of the LORD. 6I will add fifteen years to your life. And I will deliver you and this city from the hand of the king of Assyria. I will defend this city for My sake and for the sake of My servant David.’”

7Then Isaiah said, “Prepare a poultice of figs.” So they brought it and applied it to the boil, and Hezekiah recovered.

8Now Hezekiah had asked Isaiah, “What will be the sign that the LORD will heal me and that I will go up to the house of the LORD on the third day?”