"And whoever does of righteous deeds while he is a believer will neither fear injustice," meaning: that his evil deeds be increased upon him, "nor deprivation," meaning: that his good deeds be diminished.
﴿وَمَنْ يَعْمَلْ مِنَ الصَّالِحَاتِ وَهُوَ مُؤمن فَلَا يخَاف ظلما﴾ يَعْنِي: أَنْ يُزَادَ عَلَيْهِ فِي سيئاته ﴿وَلَا هضما﴾ أَن ينقص من حَسَنَاته.