أَلَمۡ تَرَ إِلَى ٱلَّذِينَ يُزَكُّونَ أَنفُسَهُمۚ بَلِ ٱللَّهُ يُزَكِّي مَن يَشَآءُ وَلَا يُظۡلَمُونَ فَتِيلًا
Hast thou not seen those who deem themselves pure? Rather, it is God Who purifies whomsoever He will, and they shall not be wronged so much as the thread of a date stone
Author: The Study Quran