Sahih al-Bukhari 4590
Narrated Sa`id bin Jubair:
The people of Kufa disagreed (disputed) about the above Verse. So I went to Ibn `Abbas and asked 
him about it. He said, "This Verse:-- "And whoever kills a believer intentionally, his recompense is 
Hell." was revealed last of all (concerning premeditated murder) and nothing abrogated it."
حَدَّثَنَا آدَمُ بْنُ أَبِي إِيَاسٍ، حَدَّثَنَا شُعْبَةُ، حَدَّثَنَا مُغِيرَةُ بْنُ النُّعْمَانِ، قَالَ سَمِعْتُ سَعِيدَ بْنَ جُبَيْرٍ، قَالَ ‏{‏آيَةٌ‏}‏ اخْتَلَفَ فِيهَا أَهْلُ الْكُوفَةِ، فَرَحَلْتُ فِيهَا إِلَى ابْنِ عَبَّاسٍ فَسَأَلْتُهُ عَنْهَا فَقَالَ نَزَلَتْ هَذِهِ الآيَةُ ‏{‏وَمَنْ يَقْتُلْ مُؤْمِنًا مُتَعَمِّدًا فَجَزَاؤُهُ جَهَنَّمُ‏}‏ هِيَ آخِرُ مَا نَزَلَ وَمَا نَسَخَهَا شَىْءٌ‏.‏