Isaiah 38:7-9

Amplified Bible

⁷“This shall be the sign to you from the Lord, that the Lord will do this thing that He has spoken: ⁸Listen carefully, I will turn the shadow on the stairway [denoting the time of day] ten steps backward, the shadow on the stairway (^[a]sundial) of Ahaz.” And the sunlight went ten steps backward on the stairway where it had [previously] gone down.

⁹This is the writing of Hezekiah king of Judah after he had been sick and had recovered from his illness:

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Footnotes

Isaiah 38:8 Some suggest that this stairway was built to serve as a sundial; others think that it was just a stairway whose design happened to function as a kind of sundial. The Hebrew word simply means “ascent,” which can be a stair or a stairway. If it was fully exposed to the sun, the shadow must have been cast by some object, such as a pole. Otherwise, if it was covered, then perhaps there was an opening through which the sun shone and illuminated part of the stairway.