2 Kings 20:6-8

American Standard Version

⁶ And I will add unto thy days fifteen years; and I will deliver thee and this city out of the hand of the king of Assyria; and I will defend this city for mine own sake, and for my servant David’s sake. ⁷ And Isaiah said, Take a cake of figs. And they took and laid it on the boil, and he recovered.

⁸ And Hezekiah said unto Isaiah, What shall be the sign that Jehovah will heal me, and that I shall go up unto the house of Jehovah the third day?