Which was revealed in Makkah

بِسْمِ اللَّهِ الرَّحْمَـنِ الرَّحِيمِ

In the Name of Allah, the Most Beneficent, the Most Merciful.

Thereafter the verse reads:

وَجَعَلْنَا النَّهَارَ‌ مَعَاشًا (and made the day a source of livelihood....78:11). Man requires, together with sleep, other essentials of life, such as livelihood. Otherwise, the sleep will turn into death. If the world would have had only nights and no days, and man would have continued to sleep all the time, how would he have obtained his livelihood and other essentials, whereas day is the time when he could work hard and make activities in the daylight in order to earn a living. Thus the verses under comment purport to say that Allah has, in order to complete the comforts of life, made the night a cloak and the day for earning a living. وَجَعَلْنَا سِرَ‌اجًا وَهَّاجًا .