أَلَمْ تَرَ إِلَىٰ رَبِّكَ كَيْفَ مَدَّ ٱلظِّلَّ وَلَوْ شَآءَ لَجَعَلَهُۥ سَاكِنًا ثُمَّ جَعَلْنَا ٱلشَّمْسَ عَلَيْهِ دَلِيلًا
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.
Tafsir note (Ibn Kathir): Here Allah begins explaining the evidence for His existence and His perfect power to create various things and pairs of opposites. Allah says:
Reflection
This verse is a small portion of the Quran's living guidance. Take a moment to sit with it, then return tomorrow for another.