Quran 4:49 from Surah An-Nisaa on Divine Marvels.
أَلَمۡ تَرَ إِلَى ٱلَّذِينَ يُزَكُّونَ أَنفُسَهُمۚ بَلِ ٱللَّهُ يُزَكِّي مَن يَشَآءُ وَلَا يُظۡلَمُونَ فَتِيلًا
English translation: Do not you see [towards] those who claim purity (for) themselves Nay (it is) Allah He purifies whom He wills and not they will be wronged (even as much as) a hair on a date-seed
Transliteration: alam tara ila alladhina yuzakkuna anfusahum bali al-lahu yuzakki man yashau wala yuz'lamuna fatilan