Sahih Muslim
The Book Pertaining to the Turmoil and Portents of the Last Hour (Kitab Al-Fitan wa Ashrat As-Saah)
Book Number: 041 / Hadith Number: 6971
Abu Huraira reported that Allah's Apostle (may peace be upon him) as saying: This tribe of the Quraish would kill (people) of wy Ummah. They (the Companions) said: What us to do (in such a situations)? Thereupon he said: Would that the people remain aside from them (and not besmear their hand with the blood of the Muslim).