الَّذِينَ يَخْشَوْنَ رَبَّهُم بِالْغَيْبِ وَهُم مِّنَ السَّاعَةِ مُشْفِقُونَ
[21:49]
(For) those who fear their Lord in secret and they are fearful of the hour.
Those who fear their Lord in their most secret thoughts, and who hold the Hour (of Judgment) in awe.
Those who fear their Lord in secret and who dread the Hour (of doom).