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." TheProphet said, "Woe to you! Who could do justice if I did not? I would be a desperate loser if I did notdo justice." `Umar said, "O Allah's Messenger (ﷺ)! Allow me to chop his head off." The Prophet (ﷺ) said, "Leavehim, for he has companions who pray and fast in such a way that you will consider your fastingnegligible in comparison to theirs. They recite Qur'an but it does not go beyond their throats (i.e. theydo not act on it) and they will desert Islam as an arrow goes through a victim's body, so that thehunter, on looking at the arrow's blade, would see nothing on it; he would look at its Risaf and seenothing: he would look at its Na,di and see nothing, and he would look at its Qudhadh ( 1 ) and seenothing (neither meat nor blood), for the arrow has been too fast even for the blood and excretions tosmear. The sign by which they will be recognized is that among them there will be a black man, oneof whose arms will resemble a woman's breast or a lump of meat moving loosely. Those people willappear when there will be differences amongst the people." I testify that I heard this narration fromAllah's Messenger (ﷺ) and I testify that `Ali bin Abi Talib fought with such people, and I was in hiscompany. He ordered that the man (described by the Prophet (ﷺ) ) should be looked for. The man wasbrought and I looked at him and noticed that he looked exactly as the Prophet (ﷺ) had described him.