49أَلَم تَرَ إِلَى الَّذينَ يُزَكّونَ أَنفُسَهُم ۚ بَلِ اللَّهُ يُزَكّي مَن يَشاءُ وَلا يُظلَمونَ فَتيلًا(Irfan-ul-Quran)Have you not seen the people who show themselves off as pure? Nay, Allah is the One Who purifies whom He pleases and they will not be wronged even equal to a thread.