It is narrated from Abu Salamah that a man came to Abu Sa'id (may Allah be pleased with him) and said, "Have you heard the Messenger of Allah (peace and blessings be upon him) say anything about the Haruriyyah, that is, the Khawarij?" He said: I heard the Prophet (peace and blessings be upon him) mention them, and he said that these people will go to great lengths and depths in religion, and they will be so pious that you will consider your own prayers and fasts insignificant compared to theirs. But they will exit the religion as swiftly as an arrow passes through its prey, such that the hunter, upon picking up his arrow and examining it, finds no trace on it. Then he inspects its tip, but finds no sign; then he looks at the shaft, but sees no trace there either; then he carefully examines the feathers, and he remains uncertain whether there is any trace or not.