Surah Al-Baqarah, ayah 12

2:12

أَلَآ إِنَّهُمۡ هُمُ ٱلۡمُفۡسِدُونَ وَلَٰكِن لَّا يَشۡعُرُونَ ١٢

Alā innahum humul-mufsidūna walākil lā yash'urūn

Unquestionably, it is they who are the corrupters, but they perceive [it] not.