Sahih Bukhari
Afflictions and the End of the World
Volume: 009 / Book Number: 088 / Hadith Number: 201
Narrated Jarir:
The Prophet 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."