49أَلَم تَرَ إِلَى الَّذينَ يُزَكّونَ أَنفُسَهُم ۚ بَلِ اللَّهُ يُزَكّي مَن يَشاءُ وَلا يُظلَمونَ فَتيلًاA. J. ArberryHast thou not regarded those who purify themselves? Nay; only God purifies whom He will; and they shall not be wronged a single date-thread.