﴿ ٱلَّذِينَ يَخْشَوْنَ رَبَّهُم بِٱلْغَيْبِ وَهُم مِّنَ ٱلسَّاعَةِ مُشْفِقُونَ ﴾

“who stand in awe of their Sustainer although He is beyond the reach of human perception, and who tremble at the thought of the Last Hour.”

those who fear their Lord in concealment from people that is when they are in seclusion from them and who on account of the Hour that is on account of its terrors are apprehensive fearful.