One of the signs of the Hour mentioned by the rosuul is the great amount of killing, to such an extent that one man will kill another without knowing the reason why he killed him. Likewise the one killed won’t know why he was killed.
Abu Hurayrah (RA) narratd that the Messenger of Allah (SAW) said: by the One Whose hand is my soul, this world will not come to an end until there comes a day when the killer will not know why he killed and the one who was killed will not know why he was killed. It was asked, “How can that be? “ He said “Al-Harj (killing), and the killer and the slain will both be in Hell” (recorded by Muslim)
Killing began with the murder of ‘‘Uthman and from there, wars began to increase with no convincing reason; thousands of people fell victim to them, especially with the destructive weapons that are used today in those terrible wars.
Some statistics on numbers of slain people in some wars:
• World war 1: 15 million killed
• World war 2: 55million killed
• Vietnam war : 3 million killed
• Russian civil war: 10 million killed
• Spanish civil war: 12 million killed
• Iraq-Iran war(1st Gulf war): 1 million killed
• Invasion of Iraq: more than 1 million killed
• Central African Republic
• Burma and sir lanka to mention few.
These wars, even though the hadith, “the will not know why he killed” does not apply to some of them, are listed to demonstrate how widespread and common killing will become.