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ʾinna llāha lā yaẓlimu mithqāla dharratin wa-ʾin taku ḥasanatan yuḍāʿifhā wa-yuʾti min ladunhu ʾajran ʿaẓīman
Indeed Allah does not wrong [anyone] [even to the extent of] an atom’s weight, and if it be a good deed He doubles it[s reward], and gives from Himself a great reward.
— Ali Quli Qarai
Surah An-Nisa', Verse 40
40. "Verily Allah does not do injustice even of the weight of an atom, and if there he a good deed He multiplies it and gives from Himself a great reward."
This verse, addressing the faithless and niggardly persons, whose status was introduced in the former verses, says:
The Arabic term /Ẓarrah/ originally means very small ant which is not seen easily; but, gradually it has been applied for every small thing. Accordingly, nowadays, 'atom', which is any of the smallest particles of an element, is also called /Ẓarrah/. And, in view of the fact that the Arabic word /miṣqal/ means 'weight', the Qur'anic phrase /miṣqala Ẓarratin/ means 'the weight of an extraordinary small thing'. Then, the verse adds that: not only Allah does not do injustice, but also:
Why Does Allah not Do Injustice?
The root of injustice is usually either ignorance, or fear, or need, or greed, etc, but Allah, Who is the Self-Sufficient, Omniscient, and Glorified, does not do injustice. Moreover, Allah has enjoined people to equity and goodness Himself, then how does He do injustice? Yet, His reward is manifold: (ten-fold, hundred-fold, or more).