Sahih Muslim Book 41, Hadith Number 6971.

Chapter : The Last Hour would not come until a person would pass by a grave and wish that he should have been the occupant of that grave because of this calamity.

Abu Huraira reported that Allah’s Apostle (may peace be upon him) as saying: This tribe of the Quraish would kill (people) of 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).