Hadith 4006 - 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 Zaid bin Thabit said: "This Verse - 'And whoever kills a believer intentionally, his recompense is Hell' - was revealed six months after the Verse which was revealed in Surat Al-Furqan."

Reference: 4006
English reference: Vol. 5, Book 37, Hadith 4011
In-book reference: Book 37, Hadith 41
Grade: Hasan (Darussalam)
Read this hadith from Darussalam Collection

2) باب تَعْظِيمِ الدَّمِ ‏‏

أَخْبَرَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، قَالَ حَدَّثَنَا الأَنْصَارِيُّ، قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ عَمْرٍو، عَنْ أَبِي الزِّنَادِ، عَنْ خَارِجَةَ بْنِ زَيْدٍ، عَنْ زَيْدِ بْنِ ثَابِتٍ، قَالَ نَزَلَتْ هَذِهِ الآيَةُ ‏{‏ وَمَنْ يَقْتُلْ مُؤْمِنًا مُتَعَمِّدًا فَجَزَاؤُهُ جَهَنَّمُ خَالِدًا فِيهَا ‏}‏ الآيَةُ كُلُّهَا بَعْدَ الآيَةِ الَّتِي نَزَلَتْ فِي الْفُرْقَانِ بِسِتَّةِ أَشْهُرٍ ‏.‏ قَالَ أَبُو عَبْدِ الرَّحْمَنِ مُحَمَّدُ بْنُ عَمْرٍو لَمْ يَسْمَعْهُ مِنْ أَبِي الزِّنَادِ ‏.‏