The Criterion - 25:45
Have you noticed how your Lord lengthens the shadow? Had He willed, He could have made it motionless. Indeed, We made the sun a proof for it (We made the existence of the shadow dependent on the light).
Related:
The Bee/16:48
Do they not look at what Allah has created that their shadows creep from the right and the left, prostrating to Allah?
اَوَلَمْ يَرَوْا اِلٰى مَا خَلَقَ اللّٰهُ مِنْ شَيْءٍ يَتَفَيَّؤُ۬ا ظِلَالُهُ عَنِ الْيَم۪ينِ وَالشَّمَٓائِلِ سُجَّداً لِلّٰهِ وَهُمْ دَاخِرُونَ