(Al-Muaminoon) 23 : 17
وَلَقَدْ خَلَقْنَا فَوْقَكُمْ سَبْعَ طَرَائِقَ وَمَا كُنَّا عَنِ الْخَلْقِ غَافِلِينَ
And surely, We have created above you seven layered heavens, and We have never been heedless of Our creation.
It is told in verse 67: 3 that Lord has created heavens in layers. The soul of mankind has to undergo seven phases as told in verses 71: 14 and 84: 19. See explanation 13: 2-3; 15: 16; 17: 1 and 21: 30-32.