The Family Of Imran - 3:191
"Those who remember Allah while standing, sitting and lying on their sides. They think about the structure and creation of the heavens and the earth: "Our Lord, You did not create them in vain, You are exalted, protect us from the torment of the Fire."
Why did Allah create the heavens and the earth?
Prophet Hud/11:7
"He it is Who created the heavens and the earth in six days, to test which of you is the best in work. His sovereignty was over the waters. Nevertheless, if you say to the disbelievers, "You will be resurrected after death,"they will say, "This is only clear magic."
The Cave/18:7
We have adorned the earth with its materials to test who will be righteous.
The Kingdom/67:2
He it is Who created death and life to test which of you is best in deeds. He is the Exalted, the Forgiving.