The Letter Qaf - 50:6
Have they not looked at the heaven above them, how We made it without any crack and how We adorned it?
A reminder to those who think that resurrection is impossible in the context of verses 1, 2...5: The creation of the heavens and the earth, and the spreading of various creatures in them, is a sign that they can be recreated, and therefore resurrection:
Yaseen/36:81
He Who created the heavens and the earth, is He not able to create like them? Indeed He is the Creator, the Knower.
The Night Journey/17:99
Do they not think that Allah, Who created the heavens and the earth, is able to create their like again? Indeed, He has set for them a definite and certain term. The wrongdoers still disbelieve.
Prophet Abraham/14:48
On the Day when the earth is replaced by another earth and the heavens by other heavens, and everyone is brought before Allah, the One and the Most High.
The Cave/18:47
On the Day when We sweep away the mountains and leave the earth bare, We will gather them without leaving a single one.
Ta-Ha/20:105
"They ask you about the mountains. Say, "My Lord will crumble them and scatter them."
Ta-Ha/20:106
He will leave them flat and empty.
Ta-Ha/20:107
You will not see therein the slightest curve or bump.
The Prophets/21:104
On that Day We will fold the heaven as if it were a file and return it to the state in which We started the creation. A promise is upon Us; We shall surely fulfill it.