Sahih Bukhari Volume 6, Book 60, Hadith Number 287.

Narrated By Said bin Jubair : I asked Ibn ‘Abbas about Allah’s saying:

‘…this reward is Hell Fire.’ (4.93) He said, “No repentance is accepted from him (i.e. the murderer of a believer).” I asked him regarding the saying of Allah:

‘Those who invoke not with Allah any other god.’… (25.68)

He said, “This Verse was revealed concerning the pagans of the pre-lslamic period.”