أَلَمْ تَرَ إِلَى الَّذِينَ يُزَكُّونَ أَنفُسَهُم ۚ بَلِ اللَّهُ يُزَكِّي مَن يَشَاءُ وَلَا يُظْلَمُونَ فَتِيلًا (49)
(4:49) Have you not seen those who boast of their righteousness, even though it is Allah Who grants righteousness to whomsoever He wills? They are not wronged even as much as the husk of a date-stone (if they do not receive righteousness).