Tafsir of An-Naba' 78:11

And We have made the day for livelihood. meaning, `We made it radiant, luminous, and shining so that the people would be able to move about in it.' By it they are able to come and go for their livelihood, earning, business dealings and other than that as well. In reference to Allah's statement,

وبنينا فوقكم سبعا شدادا