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I.e., "remember God at all times". Apart from this general exhortation, the hours mentioned above circumscribe the times of the five daily prayers incumbent upon a Muslim. The "evening hours" indicate the prayer after sunset (maghrib) as well as that after nightfall ('isha').
This verse outlines the times of the five daily prayers. The evening refers to Maghrib and ’Ishâ' prayers, the morning refers to Fajr, the afternoon refers to ’Aṣr, and noon refers to Ẓuhr.