2 Kings 20:6-8

Revised Standard Version

⁶ 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.” ⁷ And Isaiah said, “Bring a cake of figs. And let them take and lay it on the boil, that he may recover.”

⁸ And Hezeki′ah said to Isaiah, “What shall be the sign that the Lord will heal me, and that I shall go up to the house of the Lord on the third day?”