It was reported in ĥadiitħs by Aĥmad, At-Tirmidħiyyy, Ad-Daarimiyy and Aţ-Ţaĥaawiyy that the Prophet r was asked, after telling them that knowledge of the religion will disappear in the future, “O Prophet of Aļļaah, how can knowledge disappear when we have copies of the Qur’aan and we have learned what they contain, and we have taught our children and our wives and our servants?” He raised his head in anger and said, “These Jews and Christians have with them their scriptures, yet they did not learn from them what their prophets brought them.” That is, books alone are not enough; there must also be scholars that transfer the knowledge from one generation to the next, and can explain what is found in books.
 A ĥadiitħ is a statements about what the Prophet said, did or did not do in different circumstances.
 Aĥmad ibn Muĥammad ibn Ĥanbal Asħ-Sħaybaaniyy Al-Waa’iliyy (164 h. – 241 h.) is the Imam of the fourth school of fiqh: the Ĥanbaliyy school of Islamic Jurisprudence. His father was a governor in Sarkħas, but Imaam Aĥmad grew up in Bagħdaad. He devoted his life to teaching and learning, and is said to have memorized some 1 million ĥadiitħs. He was imprisoned and beaten from some time by a ruler who was influenced by a deviant sect. Az-Zirikliyy, Al-‘Aˆlaam (2002), 1/203.
 Muĥammad ibn ˆIisaa ibn Sawrah ibn Muusaa ibn Ađ-Đaĥĥaak As-Sulamiyy Al-Buugħiyy At-Tirmidħiyy, Abuu ˆIisaa (209-279 AH/ 824-892 AD). He was a great scholar of ĥadiitħ and is the author of one of the six most reliable ĥadiitħ collections. He became blind towards the end of his life. Ibid., 6/322.
 ˆAbduļļaah ibn ˆAbdurRaĥmaan ibn Al-Fađl ibn Bahraam At-Tamiimiyy Ad-Daarimiyy As-Samarqandiyy (181-255 AH/797-869 AD.) He was a great scholar of Islamic Jurisprudence (fiqh) and ĥadiitħ. He was one of the teachers of Muslim, the author of the ĥadiitħ collection “Şaĥiiĥ Muslim.” Ibid., 4/95-96.
 Aĥmad ibn Muĥammad ibn Salaamah Al-‘Azdiyy Aţ-Ţaĥaawiyy, Abuu Jaˆfar (239-321 AH/ 853-933 AD). The great jurisprudent and ĥadiitħ scholar. He was born in Şaˆiid in Egypt, and was the nephew of Al-Muzaniyy, a famous student of Asħ-Sħaafiˆiyy. Aţ-Ţaĥaawiyy first studied jurisprudence in the Sħaafiˆiyy school, but later became the head of the Ĥanafiyy school in Egypt at his time. Among his famous books is his manifesto of the creed of Sunni Islaam, known as the creed of Aţ-Ţaĥaawiyy. Ibid., 1/206.