From the Glorious Quran,
the Proof called The Poets

Verily this is a Revelation from the Lord of the Worlds:
With it came down the spirit of Faith and Truth-
To thy heart and mind, that thou mayest admonish.
In the perspicuous Arabic tongue.
Without doubt it is (announced) in the mystic Books of former peoples.
Is it not a Sign to them that the Learned of the Children of Israel knew it (as true)?
Had We revealed it to any of the non-Arabs,
And had he recited it to them, they would not have believed in it. (Because they wouldn't have understood the language)

..and it goes on to say:


Shall I inform you, (O people!), on whom it is that the evil ones descend?
They descend on every lying, wicked person,
(Into whose ears) they pour hearsay vanities, and most of them are liars.
And the Poets,- It is those straying in Evil, who follow them:
Seest thou not that they wander distracted in every valley?-
And that they say what they practise not?-

Except those who believe, work righteousness, engage much in the remembrance of Allah, and defend themselves only after they are unjustly attacked. And soon will the unjust assailants know what vicissitudes their affairs will take!