Hadith 4002 - The Book of Fighting [The Prohibition of Bloodshed] - Sunan An-Nasa'i - سنن النسائي - Collection of Actions, Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم) - Kutub as-Sittah

37. The Book of Fighting [The Prohibition of Bloodshed] - كتاب تحريم الدم

2) Chapter: The Gravity of the Sin of Shedding Blood

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.'"

Reference: 4002
English reference: Vol. 5, Book 37, Hadith 4007
In-book reference: Book 37, Hadith 37
Grade: Sahih (Darussalam)
Read this hadith from Darussalam Collection

2) باب تَعْظِيمِ الدَّمِ ‏‏

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 ‏.‏