Learning and Teaching in Islam: To acquire knowledge is a religious duty in Islam. The Prophet has said, "To seek knowledge is incumbent upon every Muslim." According to fully established hadiths which elucidate the meaning of this saying, knowledge here means the three principles of Islam : unity or tawhid ; prophecy or nubuwwat; and eschatology or ma'ad. In addition to these principles, Muslims are expected to acquire knowledge of the subsidiary branches and the details of the injunctions and laws of Islam according to their individual circumstances and needs.
It is clear that acquiring knowledge of the principles of religion, even if it be in summary fashion, is possible to a certain extent for everyone. But acquiring detailed knowledge of the injunctions and laws of religion through use of the basic documents of the Book and the Sunnah and technical reasoning based upon them (or what is called demonstrative jurisprudence, fiqh-i istidlali ) is not possible for every Muslim. Only a few persons have the capacity for demonstrative jurisprudence, nor is such acquiring of detailed knowledge required of everyone, for there are no injunctions in Islam requiring one to do what lies beyond his abilities.
Therefore, the study of Islamic injunctions and laws through reasoning has been limited through the principle of "sufficient necessity" (wajib-i kifa'i) to those individuals who have the necessary capability and are worthy of such study. The duty of the rest of the people, according to the general principle of the necessity for the ignorant to depend on the one who knows, is to seek guidance from capable and worthy men of learning, who are called mujtahids and faqihs . This act of following mujtahids is called imitation or taqlid . Of course this imitation differs from imitation in the principles of religious knowledge which is forbidden according to the very text of the Quran, "(O man), follow not that whereof thou hast no knowledge." (Quran, XVII, 36).