النساۤء — An-Nisa' Ayat 40
اِنَّ اللّٰهَ لَا يَظْلِمُ مِثْقَالَ ذَرَّةٍ ۚوَاِنْ تَكُ حَسَنَةً يُّضٰعِفْهَا وَيُؤْتِ مِنْ لَّدُنْهُ اَجْرًا عَظِيْمًا
Innallāha lā yaẓlimu miṡqāla żarrah(tin), wa in taku ḥasanatay yuḍā‘ifhā wa yu'ti mil ladunhu ajran ‘aẓīmā(n).
"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."