Chapter 37: Trials and Fierce Battles (Kitab Al-Fitan Wa Al-Malahim)
Narrated Sa' id ibn Zayd: We were with the Prophet (ﷺ). He mentioned civil strife (fitnah) and expressed its gravity. We or the people said: Messenger of Allah, if this happens to us it will destroy us. The Messenger of Allah (ﷺ) said; No. It is enough for you that you would be killed. Sa' id said: I saw that my brethren were killed.
Sunan Abi Dawud 4277