Sahih al-Bukhari Book 61, Hadith 117
While we were with Allah's Messenger (ﷺ) who was distributing (i.e. some property), there came Dhu-l-
Khuwaisira, a man from the tribe of Bani Tamim and said, "O Allah's Messenger (ﷺ)! Do Justice." The
Prophet said, "Woe to you! Who could do justice if I did not? I would be a desperate loser if I did not
do justice." `Umar said, "O Allah's Messenger (ﷺ)! Allow me to chop his head off." The Prophet (ﷺ) said, "Leave
him, for he has companions who pray and fast in such a way that you will consider your fasting
negligible in comparison to theirs. They recite Qur'an but it does not go beyond their throats (i.e. they
do not act on it) and they will desert Islam as an arrow goes through a victim's body, so that the
hunter, on looking at the arrow's blade, would see nothing on it; he would look at its Risaf and see
nothing: he would look at its Na,di and see nothing, and he would look at its Qudhadh ( 1 ) and see
nothing (neither meat nor blood), for the arrow has been too fast even for the blood and excretions to
smear. The sign by which they will be recognized is that among them there will be a black man, one
of whose arms will resemble a woman's breast or a lump of meat moving loosely. Those people will
appear when there will be differences amongst the people." I testify that I heard this narration from
Allah's Messenger (ﷺ) and I testify that `Ali bin Abi Talib fought with such people, and I was in his
company. He ordered that the man (described by the Prophet (ﷺ) ) should be looked for. The man was
brought and I looked at him and noticed that he looked exactly as the Prophet (ﷺ) had described him.
The Prophet (ﷺ) said, "The Hour will not be established till there is a war between two groups among whom there will be a great number of casualties, though the claims (or religion) of both of them will be one and the same. And the Hour will not be established till there appear about thirty liars, all of whom will be claiming to be the messengers of Allah. "
I relate the traditions of Allah's Messenger (ﷺ) to you for I would rather fall from the sky than attribute something to him falsely. But when I tell you a thing which is between you and me, then no doubt, war is guile. I heard Allah's Messenger (ﷺ) saying, "In the last days of this world there will appear some young foolish people who will use (in their claim) the best speech of all people (i.e. the Qur'an) and they will abandon Islam as an arrow going through the game. Their belief will not go beyond their throats (i.e. they will have practically no belief), so wherever you meet them, kill them, for he who kills them shall get a reward on the Day of Resurrection."