Qur'an 20:112

وَمَن يَعْمَلْ مِنَ ٱلصَّـٰلِحَـٰتِ وَهُوَ مُؤْمِنٌ فَلَا يَخَافُ ظُلْمًا وَلَا هَضْمًا

And he who hath done some good works, being a believer, he feareth not injustice nor begrudging (of his wage).