Quran 5:32
“…whosoever killeth a human being… it shall be as if he had killed all mankind, and whoso saveth the life of one, it shall be as if he had saved the life of all mankind…”

Now, judge for yourself to which category those belong who have been killing the Shia in Iraq:
http://www.bbc.co.uk/news/world-middle-east-24923794