Quran 2:12 from Surah Al-Baqara on Divine Marvels.
أَلَآ إِنَّهُمۡ هُمُ ٱلۡمُفۡسِدُونَ وَلَٰكِن لَّا يَشۡعُرُونَ
English translation: Beware indeed they themselves (are) the ones who spread corruption [and] but not they realize (it)
Transliteration: ala innahum humu al-muf'siduna walakin la yash'uruna