2:12
أَلَآ إِنَّهُمْ هُمُ ٱلْمُفْسِدُونَ وَلَـٰكِن لَّا يَشْعُرُونَ ١٢
Saheeh International
Unquestionably, it is they who are the corrupters, but they perceive [it] not.
Tafsir of "Ibn Kathir" (English)
Verily, they are the ones who make mischief, but they perceive not.This Ayah means that the hypocrites' behavior, and their claim that it is for peace, is itself mischief, although in their ignorance, they do not see it to be mischief