أَلَم تَرَ إِلىٰ رَبِّكَ كَيفَ مَدَّ الظِّلَّ وَلَو شاءَ لَجَعَلَهُ ساكِنًا ثُمَّ جَعَلنَا الشَّمسَ عَلَيهِ دَليلًا

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.