اَلَمۡ تَرَ اِلٰي رَبِّكَ كَيۡفَ مَدَّ الظِّلَّۚ وَلَوۡ شَآءَ لَجَعَلَهٗ سَاكِنًاۚ ثُمَّ جَعَلۡنَا الشَّمۡسَ عَلَيۡهِ دَلِيۡلًاۙ‏

Have you not considered your Lord - how He extends the shadow, and if He willed, He could have made it stationary? Then We made the sun for it an indication