Relate O Muhammad to your people the narrative of Hud, a brother of 'Ad -the 'Adites-, a spectacle and a warning, He cautioned his people, who inhabited the valley of the sandy hills -Al Ahqaf-, against the danger of denying Allah, especially when other Messengers have preceded and others succeeded him and the peoples' fate served as a deterrent. He said to them: " I fear for you an immense punishment on a great Day. "