Abu Sa`id al-Khudri said:While we were with God's messenger when he was dividing portions, Dhul Khuwaisira, a man of the B. Tamim, came to him and said, "Act equitably, messenger of God." He replied, "Out upon you! Who will act equitably if I do not? You will be disappointed and losing if I do not act equitably." `Umar asked permission to cut off his head, but he replied, "Leave him alone, for he has companions [1] in comparison with whose prayers any of you would despise his, and in comparison, with whose fasting any of you would despise his. They recite the Quran but it does not pass their collarbones. They swerve from the religion as an arrow goes through the animal aimed at. Their look is directed to its head, on to the sinew on its socket, on to its nadi, which is its rod, on to its feathers, but there is no sign of excrement or blood on it [2] . They will be recognised by the presence of a black man one of whose upper arms quivers like a woman's breast, or like a piece of meat, and they will revolt against the best section of mankind [3] . Abu Sa'id said: I testify that I heard this tradition from God's messenger, and I testify that `Ali b. Abu Talib fought with them and that I was with him. He gave orders about that man who was sought for, and when he was brought in and I looked at him, he was exactly as the Prophet had described him. A version has: A man with deep-set eyes, a projecting brow, a thick beard, high cheekbones and a shaven head came forward and said, "Fear God, Muhammad." He replied, "Who will obey God if I disobey Him? God entrusts me with power over the inhabitants of the earth but you [4] do not." A man asked to be allowed to kill him but he prevented him. Then when the man turned away, he said, "From this one's stock there will be people who recite the Quran, yet it will not pass their throats. They will swerve from Islam as an arrow goes through the animal shot at. They will kill the followers of Islam and leave the worshippers of idols alone; but if I live to their time, I shall certainly kill them as `Ad were killed." 1. People like him, or people at a later period who will acquire a reputation for piety. The reference is to the Kharijites. 2. Just as an arrow can go through an animal without traces of excrement or blood, they will abandon Islam so quickly that no trace of it will be left in them. 3. `Ali and his party. 4. The pronoun is plural, indicating the man and his people. (Bukhari and Muslim.)