Surah Al-Baqarah — Ayah 12 (2:12)
أَلَآ إِنَّهُمۡ هُمُ ٱلۡمُفۡسِدُونَ وَلَٰكِن لَّا يَشۡعُرُونَ ١٢
English translation (Saheeh International)
Unquestionably, it is they who are the corrupters, but they perceive [it] not.
Brief commentary
The truth is that it is they who ruin things, but they do not admit this, nor do they know that their actions are the cause of all ruin.