'The right of the one who trains you in knowledge is to magnify him, to revere his sessions, to listen to him attentively, and to pay attention to him with devotion. You should not raise your voice to him, nor answer a question that someone has asked him about something, so that he will be the one to answer. You should not address anyone else in his session, nor backbite anyone in his presence. You must defend him if anyone ever speaks ill of him in your presence, conceal his faults and publicise his virtues. You should not sit in the company of his enemy, nor be hostile towards his friend. If you fulfil this right, Allah's angels bear witness that you frequented him and learned from his knowledge for the sake of Allah, exalted be His Name, and not for the sake of people.?