From Sahih Bukhari (Hadith 7080):
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: Bukhari 7080