21:49 al-ladhiyna yakhshawna rab-bahum bil gaybi wa hum minas saa'Ati mushfiquun

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Ahmed Raza Khan: Mohammed Aqib Qadri:
Those who fear their Lord without seeing and who apprehend the Last Day.

Yusuf Ali:
Those who fear their Lord in their most secret thoughts, and who hold the Hour (of Judgment) in awe.

Pickthal:
Those who fear their Lord in secret and who dread the Hour (of doom).