So whoever does righteous deeds while he is a believer – no denial will there be for his effort, and indeed We, of it, are recorders.
The following excerpt is taken from “Tafsir Ibn Kathir” under the commentary of the above verse:
So whoever does righteous good deeds while he is a believer,
meaning, his heart believes and his deeds are righteous.
his efforts will not be rejected. This is like the Ayah:
certainly We shall not make the reward of anyone who does his deeds in the most perfect manner to be lost. (18:30)
which means, his efforts will not be wasted; they will be appreciated and not even a speck of dust’s weight of injustice will be done.
Verily, We record it for him.
means, all his deeds are recorded and nothing of them at all is lost.
Kathir, Ibn. Tafsir Ibn Kathir. (surah 21 verse 94). https://archive.org/details/TafseerIbnKathirenglish114SurahsComplete