(8) باب قَوْلِ النَّبِيِّ صلى الله عليه وسلم " لاَ تَرْجِعُوا بَعْدِي كُفَّارًا، يَضْرِبُ بَعْضُكُمْ رِقَابَ بَعْضٍ
Narrated Jarir:
The Prophet (ﷺ) said to me during Hajjat-al-Wada`, "Let the people keep quiet and listen." Then he said (addressing the people), "Beware! Do not renegade as disbelievers after me by striking (cutting) the necks of one another."
Reference: Sahih al-Bukhari 7080
In-book reference: Book 92, Hadith 31
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 88, Hadith 201