Al-Tirmidhi Hadith 105

Allah's Messenger (peace be upon him) spoke of something and said: It will happen when knowledge will be no more. I said: Allah's Messenger, how will knowledge vanish despite the fact that we will be reciting the Qur'an and teaching its recitation to our children and our children will teach its recitation to their children up to the Day of Resurrection? Thereupon he said: Ziyad, may your mother weep over you. I was of the pinion that you were one of those who have greatest understanding of religion in Medina. Do these Jews and Christians not recite the Torah and the Bible but not act according to what is contained in them?