Sahih Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Volume: 005 / Book Number: 059 / Hadith Number: 687
Narrated Jarir:
The Prophet ordered me during Hajjatul-Wada'. "Ask the people to listen." He then said, "Do not become infidels after me by cutting the necks (throats) of one another. "