Do they not then consider what is before them and what is behind them of the heaven and the earth? If We please We will make them disappear in the land or bring down upon them a portion from the heaven; most surely there is a sign in this for every servant turning (to Allah).

Now, surely, sincere obedience is due to Allah (alone) and (as for) those who take guardians besides Him, (saying), We do not serve them save that they may make us nearer to Allah, surely Allah will judge between them in that in which they differ; surely Allah does not guide him aright who is a liar, ungrateful.

Say: O Allah! Originator of the heavens and the earth, Knower of the unseen and the seen! Thou (only) judgest between Thy servants as to that wherein they differ.

When their messengers came to them from before them and from behind them, saying, Serve nothing but Allah, they said: If our Lord had pleased He would certainly have sent down angels, so we are surely unbelievers in that with which you are sent.

And mention the brother of Ad; when he warned his people in the sandy plains,-- and indeed warners came before him and after him-- saying Serve none but Allah; surely I fear for you the punishment of a grievous day.