Dr. Mustafa Khattab, the Clear Quran - Surah Al-Anbya, ayah 49

Translation of Surah Al-Anbya, ayah 49 (21:49)

ٱلَّذِينَ يَخۡشَوۡنَ رَبَّهُم بِٱلۡغَيۡبِ وَهُم مِّنَ ٱلسَّاعَةِ مُشۡفِقُونَ ٤٩
who are in awe of their Lord without seeing Him,1 and are fearful of the Hour.

Foot notes

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This can also mean that they are in awe of their Lord as much in private as they are in public.