Sahih al-Bukhari 4764
Narrated Sa`id 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."
حَدَّثَنَا آدَمُ، حَدَّثَنَا شُعْبَةُ، حَدَّثَنَا مَنْصُورٌ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، قَالَ سَأَلْتُ ابْنَ عَبَّاسٍ ـ رضى الله عنهما ـ عَنْ قَوْلِهِ تَعَالَى ‏{‏فَجَزَاؤُهُ جَهَنَّمُ‏}‏ قَالَ لاَ تَوْبَةَ لَهُ‏.‏ وَعَنْ قَوْلِهِ جَلَّ ذِكْرُهُ ‏{‏لاَ يَدْعُونَ مَعَ اللَّهِ إِلَهًا آخَرَ‏}‏ قَالَ كَانَتْ هَذِهِ فِي الْجَاهِلِيَّةِ‏.‏