The Prophet ﷺ said to me during Hajjat-al-Wadaʿ, "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." (Using translation from Bukhārī 7080)
لِي رَسُولُ اللهِ ﷺ فِي حَجَّةِ الْوَدَاعِ «اسْتَنْصَتَ النَّاسَ» ثُمَّ قَالَ «لَا تَرْجِعُوا بَعْدِي كُفَّارًا يَضْرِبُ بَعْضُكُمْ رِقَابَ بَعْضٍ»