In those days Hezekiah became sick and was at the point of death. The prophet Isaiah son of Amoz came to him, and said to him, "Thus says the Lord: Set your house in order, for you shall die; you shall not recover."
Then Hezekiah turned his face to the wall and prayed to the Lord:
"Remember now, O Lord, I implore you, how I have walked before you in faithfulness with a whole heart, and have done what is good in your sight." Hezekiah wept bitterly.
Before Isaiah had gone out of the middle court, the word of the Lord came to him:
"Turn back, and say to Hezekiah prince of my people, Thus says the Lord, the God of your ancestor David: I have heard your prayer, I have seen your tears; indeed, I will heal you; on the third day you shall go up to the house of the Lord.
I will add fifteen years to your life. I will deliver you and this city out of the hand of the king of Assyria; I will defend this city for my own sake and for my servant David's sake."
Then Isaiah said, "Bring a lump of figs. Let them take it and apply it to the boil, so that he may recover."
Hezekiah 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?"
Isaiah said, "This is the sign to you from the Lord, that the Lord will do the thing that he has promised: the shadow has now advanced ten intervals; shall it retreat ten intervals?"
Hezekiah answered, "It is normal for the shadow to lengthen ten intervals; rather let the shadow retreat ten intervals."
The prophet Isaiah cried to the Lord; and he brought the shadow back the ten intervals, by which the sun had declined on the dial of Ahaz.
References for 2 Kings 20:11