Isaiah 38:8

8Listen carefully, I will turn the shadow on the stairway [denoting the time of day] ten steps backward, the shadow on the stairway (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.sundial) of Ahaz.” And the sunlight went ten steps backward on the stairway where it had [previously] gone down.