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إِنَّ ٱللَّهَ لاَ يَظْلِمُ مِثْقَالَ ذَرَّةٍ وَإِن تَكُ حَسَنَةً يُضَٰعِفْهَا وَيُؤْتِ مِن لَّدُنْهُ أَجْراً عَظِيماً
-An-Nisâ’ ( النساء )

Al Qushairi Tafsir

Surely God shall not wrong so much as the weight of an atom; and if it be a good deed, He will double it and give from Himself a great wage.
He does not deprive them of anything in their reward, but rather is first with his bounty for them, without their having deserved [it], and He doubles the wages for their works. It is impossible to describe what [God] has decreed as wrongdoing because the creation is His creation and the kingdom is His kingdom. The wrongdoer is one who transgresses a limit which has been ordained for him-it is impossible to describe the glory of [God's] sublime measure in this way.