Denying the revelations of Allah is the worst sin imaginable.
10:17
"Ignominy overtaketh them - They have no protector from Allah -
as if their faces had been covered with a cloak of darkest night. Such are rightful owners of the Fire." 10:27
On the last day Allah will kill all the disbelievers (and then he will torture them forever in hell).
10:45
Those who disbelieved will face a dreadful doom. 10:70
Allah drowned those who disbelieved his revelations. 10:73
Moses asked Allah to harden the hearts of the Egyptians so that they would not
believe until they saw the painful doom. 10:88
If you deny the revelations of Allah, you will be among the losers and will "see the painful doom."
10:95-97
