Surah An-Nisa Verse 49 - English Translation by Muhammad Mahmoud Ghali
Surah An-Nisaأَلَمۡ تَرَ إِلَى ٱلَّذِينَ يُزَكُّونَ أَنفُسَهُمۚ بَلِ ٱللَّهُ يُزَكِّي مَن يَشَآءُ وَلَا يُظۡلَمُونَ فَتِيلًا
Have you not regarded (the ones) who consider themselves cleansed? No indeed, Allah cleanses whomever He decides, and they will not be done an injustice even as (much as) a (single) date-plaiting (i.e., not even a small amount)