Surah An-Najm 53:39

وَأَن لَّيْسَ لِلْإِنسَـٰنِ إِلَّا مَا سَعَىٰ

And that there is not for man except that [good] for which he strives

Translation: Saheeh International

Tafsir

and that wa-an to be understood as wa-annahu man shall have only what he himself strives for of good deeds and so he shall not have anything of the reward for good deeds striven for by another;

Excerpt from Tafsir al-Jalalayn, commentary on 53:39, via Quran.com. The reader has the full commentary and 9 more tafsirs.