أَخْبَرَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، قَالَ حَدَّثَنَا مُحَمَّدٌ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ مَنْصُورٍ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، قَالَ أَمَرَنِي عَبْدُ الرَّحْمَنِ بْنُ أَبِي لَيْلَى أَنْ أَسْأَلَ ابْنَ عَبَّاسٍ، عَنْ هَاتَيْنِ الآيَتَيْنِ، ‏{‏ وَمَنْ يَقْتُلْ مُؤْمِنًا مُتَعَمِّدًا فَجَزَاؤُهُ جَهَنَّمُ ‏}‏ فَسَأَلْتُهُ فَقَالَ لَمْ يَنْسَخْهَا شَىْءٌ ‏.‏ وَعَنْ هَذِهِ الآيَةِ ‏{‏ وَالَّذِينَ لاَ يَدْعُونَ مَعَ اللَّهِ إِلَهًا آخَرَ وَلاَ يَقْتُلُونَ النَّفْسَ الَّتِي حَرَّمَ اللَّهُ إِلاَّ بِالْحَقِّ ‏}‏ قَالَ نَزَلَتْ فِي أَهْلِ الشِّرْكِ ‏.‏

It was narrated that Sa'eed bin Jubair said: "Abdur-Rahman bin Abi Laila told me to ask Ibn 'Abbas about two Verses: 'And whoever kills a believer intentionally, his recompense is Hell.' I asked him and he said: 'Nothing of this has been abrogated.' (And I asked him about the Verse): 'And those who invoke not any other ilah (god) along with Allah, or kill such person as Allah has forbidden, except by right,' he said: 'This was revealed concerning the people of Shirk.'" Translation Not Available

Book Ref: Sunan An Nisai Book 37 Hadith 4002
Web Ref:  Sunan An Nisai Vol 5 Book 37 Hadith 4007