Surah Al-Baqarah — Ayah 9 (2:9)
يُخَٰدِعُونَ ٱللَّهَ وَٱلَّذِينَ ءَامَنُواْ وَمَا يَخۡدَعُونَ إِلَّآ أَنفُسَهُمۡ وَمَا يَشۡعُرُونَ ٩
English translation (Saheeh International)
They [think to] deceive Allāh and those who believe, but they deceive not except themselves and perceive [it] not.
Brief commentary
They think that they can deceive Allah and the believers by acting outside as if they believe, while inside hiding their disbelief; but really, they only deceive themselves, without realising it. Allah knows all that is secret and hidden, and has told the believers what these people are like.