Muwatta Imam Malik (Riwayat Ibn al-Qasim)

It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that I heard the Messenger of Allah (peace and blessings be upon him) say: "A people will emerge among you such that you will consider your prayers insignificant compared to their prayers, your fasts compared to their fasts, and your deeds compared to their deeds. They will recite the Qur'an but it will not go beyond their throats. They will go out of the religion just as an arrow passes through its prey. If you look at the arrowhead, you will find nothing (of blood, etc.) on it; if you look at the shaft, you will find nothing on it; if you look at its feathers, you will find no trace on them; and you will doubt about the arrow's nock (the place where the bowstring rests) whether there is any effect on it or not."