ISA 38:8

8 Hineni, I will bring again the tzel [(shadow)] of the hama'alot [(the steps)], which has gone down with the shemesh on the Ma'alot Achaz [(sundial of Ahaz)], so that it goes eser ma'alot [(ten steps)] backward. So the shemesh went back eser maalot [(ten steps)] on the ma'alot on which it had gone down.