Hadith 4130

It was narrated from Abu Bakrah that: The Prophet [SAW] said: "Do not revert to misguidance after I am gone, striking the necks of one another (killing one another)."

أَخْبَرَنَا عَمْرُو بْنُ زُرَارَةَ، قَالَ أَنْبَأَنَا إِسْمَاعِيلُ، عَنْ أَيُّوبَ، عَنْ مُحَمَّدِ بْنِ سِيرِينَ، عَنْ أَبِي بَكْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏"‏ لاَ تَرْجِعُوا بَعْدِي ضُلاَّلاً يَضْرِبُ بَعْضُكُمْ رِقَابَ بَعْضٍ ‏"‏ ‏.‏

Reference: 1141450
In-book reference: Book 37, Hadith 4130
Hadith 4130 - The Book of Fighting [The Prohibition of Bloodshed] - Sunan an-Nasa'i - Sunnah.com