And those who disbelieve say ‘Why has not some sign been sent down upon him upon Muhammad (s) from his Lord!’ the like of the staff and the glowing hand or the she-camel. God exalted be He says You are only a warner one to threaten the disbelievers for it is not your duty to bring forth signs; and for every folk there is a guide a prophet to guide them to their Lord with the signs that He gives him and not what with they request.