The grievous sin of Shirk (joining partners with Allah)

Narrated Abu Huraira
that Prophet Muhammad
said: On the Day of Resurrection, Ibrahim
will see his father Azar (in such a pitiable condition) that his face will be dark and covered with dust.
Then Ibrahim
will remind him: Did I not warn you against denying me? His father will reply: Today I will not deny you. Then, Ibrahim
will say: O Lord! You have promised not to disgraceful to me on the DAy of Resurrection. So what will be more disgraceful to me than my wretched father. Allah
will say: I have forbidden Paradise for disbelievers.
Then it will be said: O Ibrahim, Look! what is underneath you feet? He will look and see his father as Hyena - besmeared with dirt caught by the legs and thrown into Hell.
Note: Due to infidelity, Azar will not be forgiven in spite of his son Ibrahim`s
intersession for him and he will be transformed into an animal and cast into Hell. It also proves that the pagans whoever they are by kinship, will be forbidden from entering Paradise for ever. They will remain in Hell and suffer the agonies of torment which they had been frightened of by the Messenger of Allah
at different times.

Narrated Anas bin Malik
on the authority of the Prophet
, so said: Allah
will say to the least tormented person among the people of Hell on the Day of Resurrection: Do you have anything on earth, that you would give as a ransom (to protect yourself against the torment of Fire)? He will say: Yes. Then Allah
will say: While you were in the backbone of Adam, I had demanded you much less than that, ie. to associate nothing with Me; but you declined and worshiped others besides Me.
(This Hadith is sound and reported by Bukhari and Muslim).
Notes:This Hadith concludes that a believer with his sins covering the entire globe will be forgiven so long as he does not associate partners to Allah
Source/By :
From Authentic sources