أَلَمْ يَرَوْا أَنَّا جَعَلْنَا اللَّيْلَ لِيَسْكُنُوا فِيهِ وَالنَّهَارَ مُبْصِرًا إِنَّ فِي ذَلِكَ لَآيَاتٍ لِّقَوْمٍ يُؤْمِنُونَ
Do they not see that We made the night that they may rest in it, and the day to provide visibility. There are indeed signs in that for a people who have faith.
Agha Ali Puya Commentary
Commentary on Quran 27:86
[Pooya/Ali Commentary 27:86] Aqa Mahdi Puya says: The purpose the day and the night serve bears clear evidence to the purposefulness of the plan of the creator.