2 Kings 20:5-8

5“Return and say to 1Hezekiah the leader of My people, ‘Thus says the Lord, the God of your father David, “2I have heard your prayer, 3I have seen your tears; behold, I will heal you. On the third day you shall go up to the house of the Lord. 6I will add fifteen years to your 4life, and I will deliver you and this city from the hand of the king of Assyria; and 5I will defend this city for My own sake and for My servant David’s sake.”’” 7Then Isaiah said, “Take a cake of figs.” And they took and laid it on the boil, and he recovered.

8Now Hezekiah said to Isaiah, “What will be the sign that the Lord will heal me, and that I shall go up to the house of the Lord the third day?”