Sahih al-Bukhari 6931

Abu Salama and 'Ata' ibn Yasar reported that they went to Abu Sa'id al-Khudri and asked him about the Haruriyya*, "Did you hear the Prophet, may Allah bless him and grant him peace, say anything?" He said, "I do not know what the Haruriyya are, but I heard the Prophet, may Allah bless him and grant him peace, say, 'Some people will emerge in this nation (and he did not say, 'from this nation") whose prayer will make you think little of your prayers in comparison. They will recite the Qur'an, but it will not go beyond their throats. They will pass through the deen as an arrow passes through game. The archer looks at his arrow, arrowhead and its fastening and is unsure about its notch, and whether there is any blood on it.'" [*The Haruriyya are the Kharijites. The name is taken from Harura', a place in Iraq where they first gathered.]