Sura 4 An-Nisa (The Women), aya 40

1. إِنَّ اللَّهَ لَا يَظْلِمُ مِثْقَالَ ذَرَّةٍ ۖ وَإِنْ تَكُ حَسَنَةً يُضَاعِفْهَا وَيُؤْتِ مِنْ لَدُنْهُ أَجْرًا عَظِيمًا

   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.

   4:40

Tafsiri: Saheeh International