Quran 15:89 from Surah Al-Hijr on Divine Marvels.
وَقُلۡ إِنِّيٓ أَنَا ٱلنَّذِيرُ ٱلۡمُبِينُ
English translation: And say Indeed I [I] am a warner clear
Transliteration: waqul inni ana al-nadhiru al-mubinu