Kings IV 20:9

9 And Esaias said, This the sign from the Lord, that the Lord will perform the word which he has spoken, the shadow shall advance ten degrees: if it should go back ten degrees .

Kings IV 20:9 In-Context

7 And he said, Let them take a cake of figs, and lay it upon the ulcer, and he shall be well.
8 And Ezekias said to Esaias, What the sign that the Lord will heal me, and I shall go up to the house of the Lord on the third day?
9 And Esaias said, This the sign from the Lord, that the Lord will perform the word which he has spoken, the shadow shall advance ten degrees: if it should go back ten degrees .
10 And Ezekias said, a light thing for the shadow to go down ten degrees: nay, but let the shadow return ten degrees backward on the dial.
11 And Esaias the prophet cried to the Lord: and the shadow returned back ten degrees on the dial.

The Brenton translation of the Septuagint is in the public domain.