Melachim Bais 20:6-8

Orthodox Jewish Bible

⁶ And I will add unto thy days fifteen shanah; and I will save thee and this city out of the palm of Melech Asshur (Assyria); and I will defend this city for Mine Own sake, and for the sake of Dovid Avdi.

⁷ And Yeshayah said, Take a develet te’enim. And they took and laid it on the shechin (boil, inflamed spot) and he recovered [See Isaiah 38:21].

⁸ And Chizkiyahu (Hezekiah) said unto Yeshayah, What shall be the Ot (Sign) that Hashem will heal me, and that I shall go up into the Beis Hashem on the Yom HaShelishi?