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Ahmed Raza Khan: Mohammed Aqib Qadri:
Guard all your prayers, and the middle prayer; and stand with reverence before Allah.

Yusuf Ali:
Guard strictly your (habit of) prayers, especially the Middle Prayer; and stand before Allah in a devout (frame of mind).

Pickthal:
Be guardians of your prayers, and of the midmost prayer, and stand up with devotion to Allah.