Abu Musa narrated that the Messenger of Allah (ﷺ) said:
“Before
the
Hour comes there will be Harj.” I said: “O Messenger of
Allah, what is
Harj?” He said: “Killing.” Some of the Muslims
said: “O Messenger of
Allah, now we kill such and such a number of
idolaters in one year.”
The Messenger of Allah (ﷺ) said: “That
will not be like killing the
idolaters, rather you will kill one
another, until a man will kill his
neighbor and son of the cousin and
a relative.” Some of the people
said: “O Messenger of Allah, will
we be in our right minds that day?”
The Messenger of Allah (ﷺ)
said: “No, reason will be taken away from
most of the people at
that time, and there will be left the
insignificant people who have
no reason.”