Abu Salamah (may Allah have mercy on him) says that a man came to Hazrat Abu Sa'id Khudri (may Allah be pleased with him) and said, "Have you heard the Prophet (peace and blessings of Allah be upon him) mention the Haruriyyah sect?" He replied, "I heard the Prophet (peace and blessings of Allah be upon him) mention a people who will adopt extremism in religion. You will consider your prayers insignificant compared to their prayers, and your fasts insignificant compared to their fasts, but they will go out of the religion just as an arrow passes through its prey. A man takes his arrow, looks at its tip and sees nothing on it, then looks at its sinew and sees nothing on it, then looks at its wood and sees nothing on it, then looks at its feathers and sees nothing on them."