Surah Al-Isra' (The Night Journey), Verse 12

وَجَعَلْنَا الَّیْلَ وَالنَّهَارَ اٰیَتَیْنِ فَمَحَوْنَاۤ اٰیَةَ الَّیْلِ وَجَعَلْنَاۤ اٰیَةَ النَّهَارِ مُبْصِرَةً لِّتَبْتَغُوْا فَضْلًا مِّنْ رَّبِّكُمْ وَلِتَعْلَمُوْا عَدَدَ السِّنِیْنَ وَالْحِسَابَ وَكُلَّ شَیْءٍ فَصَّلْنٰهُ تَفْصِیْلًا ۟

Wa ja'alnal laila wannahaara Aayatayni famahawnaaa Aayatal laili wa ja'alnaaa Aayatan nahaari mubsiratal litabtaghoo fadlam mir Rabbikum wa lita'lamoo 'adadas sineena walhisaab; wa kulla shai'in fassalnaahu tafseelaa

“We have made the Night and the Day as two (of Our) Signs: the Sign of the Night have We obscured, while the Sign of the Day We have made to enlighten you; that ye may seek bounty from your Lord, and that ye may know the number and count of the years: all things have We explained in detail.”

Quran 17:12 (Yusuf Ali Translation)