﴿ أَلَمْ تَرَ إِلَى ٱلَّذِينَ يُزَكُّونَ أَنفُسَهُم ۚ بَلِ ٱللَّهُ يُزَكِّى مَن يَشَآءُ وَلَا يُظْلَمُونَ فَتِيلًا ﴾

“Art thou not aware of those who consider themselves pure? Nay, but it is God who causes whomever He wills to grow in purity; and none shall be wronged by as much as a hair's breadth.”

Have you not seen those who praise themselves for purity? namely the Jews when they say ‘We are God’s children and His beloved’ in other words it is not a matter of their purifying themselves. Nay God purifies whom He will through faith and they shall not be wronged they shall not be diminished of their deeds a single date-thread as much as the peel on a date-stone.