9. See they not what is before them and what is behind them, of the heaven and the earth? If We will, We shall sink the earth with them, or cause a piece of the heaven to fall upon them. Verily, in this is a sign for every slave who turns to Allâh in repentance (i.e. the one who believes in the Oneness of Allâh and performs deeds of His obedience and always begs His Pardon).