Surah Al-Mu'minun 23:60

وَٱلَّذِينَ يُؤْتُونَ مَآ ءَاتَوا۟ وَّقُلُوبُهُمْ وَجِلَةٌ أَنَّهُمْ إِلَىٰ رَبِّهِمْ رَٰجِعُونَ

And they who give what they give while their hearts are fearful because they will be returning to their Lord -

Translation: Saheeh International

Tafsir

and who give what they give of voluntary alms and righteous deeds while their hearts tremble with awe fearful lest it not be accepted from them because the particle lām ‘for’ is taken as implied before annahum ‘that they’ they are going to return to their Lord —

Excerpt from Tafsir al-Jalalayn, commentary on 23:60, via Quran.com. The reader has the full commentary and 9 more tafsirs.