The Holy Quran 4:40 — Surah An-Nisa

Arabic text

إِنَّ ٱللَّهَ لَا يَظْلِمُ مِثْقَالَ ذَرَّةٍ ۖ وَإِن تَكُ حَسَنَةً يُضَـٰعِفْهَا وَيُؤْتِ مِن لَّدُنْهُ أَجْرًا عَظِيمًا

Translation

Undoubtedly Allaah is not unjust even to the extent of an atom's weight (Allaah will neither decrease a person's reward to the extent of an atom's weight nor punish him to this extent for a wrong he did not do). If it were a good act (the weight of an atom), He shall multiply it (the reward) and grant a tremendous (manifold) reward from His side.

Tafsir (excerpt) — Tafsir Usmani

Justice in punishment and mercy in reward: that is, Almighty Allah does not let anyone's right go to waste, even to the weight of a speck. So the punishment that will befall these disbelievers is sheer justice and the recompense for their evil deeds.

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