2 Kings 20:2-7

Then Hezekiah turned his face to the wall and prayed to the LORD, saying, “Now, O LORD, please 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. And before Isaiah had gone out of the middle court, the word of the LORD came to him: “Turn back, and say to Hezekiah the leader of my people, Thus says the LORD, the God of David your father: I have heard your prayer; I have seen your tears. Behold, I will heal you. On the third day you shall go up to the house of the LORD, and 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 I will defend this city for my own sake and for my servant David’s sake.” And Isaiah said, “Bring a cake of figs. And let them take and lay it on the boil, that he may recover.”