Sky
Have they not seen what lies before them and behind them of the sky? If We will, We could cause the sky to fall upon them. Surely in this is a sign for every servant who turns back to Allah.
34:9Have they not observed what is before them and what is behind them of the sky and the earth? If We will, We can make the earth swallow them, or cause obliteration from the sky to fall on them. Lo! herein surely is a portent for every slave who turneth (to Allah) repentant.