Allah affirms His might and power, for He has full control over everything, and everything is subservient to Him. Therefore, everything, including the believers, prostrate to Allah willingly, while the disbelievers do so unwillingly,

﴿وَظِلَـلُهُم بِالْغُدُوِّ﴾

(and so do their shadows in the mornings), in the beginning of the days,

﴿وَالاٌّصَالِ﴾

(and in the afternoons.) towards the end of the days. Allah said in another Ayah,

﴿أَوَ لَمْيَرَوْاْ إِلَىخَلَقَ اللَّهُ مِن شَىْءٍ يَتَفَيَّأُ﴾

(Have they not observed things that Allah has created: (how) their shadows incline.) ﴿16:48﴾

﴿قُلْ مَن رَّبُّ السَّمَـوَتِ وَالاٌّرْضِ قُلِ اللَّهُ قُلْ أَفَاتَّخَذْتُمْ مِّن دُونِهِ أَوْلِيَآءَ لاَ يَمْلِكُونَ لأَنْفُسِهِمْ نَفْعًا وَلاَ ضَرًّا قُلْ هَلْ يَسْتَوِى الاٌّعْمَى وَالْبَصِيرُ أَمْ هَلْ تَسْتَوِى الظُّلُمَـتُ وَالنُّورُ أَمْ جَعَلُواْ للَّهِ شُرَكَآءَ خَلَقُواْ كَخَلْقِهِ فَتَشَابَهَ الْخَلْقُ عَلَيْهِمْ قُلِ اللَّهُ خَـلِقُ كُلِّ شَىْءٍ وَهُوَ الْوَاحِدُ الْقَهَّـرُ ﴾

(16. Say: "Who is the Lord of the heavens and the earth'' Say: "(It is) Allah.'' Say: "Have you then taken (for worship) Awliya' (protectors) other than Him, such as have no power either for benefit or for harm to themselves'' Say: "Is the blind equal to the one who sees Or darkness equal to light Or do they assign to Allah partners who created the like of His creation, so that the creation seemed alike to them'' Say: "Allah is the Creator of all things; and He is the One, the Irresistible.'')