أَلَمْ تَرَ إِلَى الَّذِينَ يُزَكُّونَ أَنفُسَهُمْ بَلِ اللّهُ يُزَكِّي مَن يَشَاء وَلاَ يُظْلَمُونَ فَتِيلاً
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سورة النساء
(4/49) Hast thou not observed those who hold themselves purified Nay! Allah purifieth whomsoever He will, and they shall not be wronged a whit.
Surah An-Nisa