Surah Ad-Dukhan — Ayah 1

وَٱلْكِتَـٰبِ ٱلْمُبِينِ

By the clear Book,

إِنَّآ أَنزَلْنَـٰهُ فِى لَيْلَةٍ مُّبَـٰرَكَةٍ ۚ إِنَّا كُنَّا مُنذِرِينَ

Indeed, We sent it down during a blessed night. Indeed, We were to warn [mankind].