Indeed, Allah does not do injustice, [even] as much as an atom's (4:40)

﴿إِنَّ اللَّهَ لَا يَظْلِمُ مِثْقَالَ ذَرَّةٍ ۖ وَإِن تَكُ حَسَنَةً يُضَاعِفْهَا وَيُؤْتِ مِن لَّدُنْهُ أَجْرًا عَظِيمًا﴾
[ النساء: 40]

4:40 Indeed, Allah does not do injustice, [even] as much as an atom's weight; while if there is a good deed, He multiplies it and gives from Himself a great reward.

Allah is Just and does not wrong His creatures in any way.
He does not lessen the good they do by the weight of even a tiny particle or dust, and He does not add to their disobedience in any way.
Even if only an atom’s worth of good is done, He multiplies the reward, from His grace, and through this increase He gives a great reward.

Surely! Allah wrongs not even of the weight of an atom (or a small ant), but if there is any good (done), He doubles it, and gives from Him a great reward.

phonetic Transliteration

Inna Allaha la yathlimu mithqala tharratin wain taku hasanatan yudaAAifha wayuti min ladunhu ajran AAatheeman

Abdullah Yusuf Ali - Translation

Allah is never unjust in the least degree: If there is any good (done), He doubleth it, and giveth from His own presence a great reward.

Safi-ur-Rahman al-Mubarakpuri

Surely! Allah wrongs not even of the weight of a speck of dust, but if there is any good (done), He doubles it, and gives from Him a great reward.

Page 85 English transliteration