By Him in Whose hand is my soul, a time would come upon the people when the killer would not know why he killed and the victim would not know why he was killed. [Muslim]

"والذي نفسي بيده ليأتينَّ على الناس زمانٌ لا يدري القاتلُ في أيِّ شيء قَتَل، ولا يدري المقتولُ على أيِّ شيء قُتِل». [صحيح.] - [رواه مسلم.]"