In The Name of Allah, The Most Merciful, The Bestower of Mercy.

Allah, The Most High, said:

مَّنْ عَمِلَ صَالِحًا فَلِنَفْسِهِ ۖ وَمَنْ أَسَاءَ فَعَلَيْهَا ۗ وَمَا رَبُّكَ بِظَلَّامٍ لِّلْعَبِيدِ

Whosoever does righteous good deed it is for (the benefit of) his ownself, and whosoever does evil, it is against his ownself, and your Lord is never at all unjust to (His) slaves. (Fussilat 46)

“Whoever does righteous good deeds”, meaning, deeds commanded by Allah and His Messenger, “it is for (the benefit of) his ownself”. Its benefit and reward return to him in this world and the Hereafter. “And whoever does evil, it is against his ownself”, meaning: its harm and punishment in this world and the Hereafter.

In this is an urge to do good and avoid evil, and that the performers of deeds are befitted through their good deeds and they are harmed by their evil deeds, and that indeed no bearer of burdens will bear the burden of another.

“And your Lord is never unjust at all to His servants”, for He does not place upon anyone more than the weight of their own misdeeds (or evil deeds).

An Excerpt from “Tafsir As-Sadi”.