'The Prophet (SAWA) once entered the mosque to find a large group of people gathered around a man, so he asked, 'Who is this?' to which they replied, 'A most learned scholar ('allama).' He then asked, 'And what is a most learned scholar?' to which they replied, '[He is ] the most knowledgeable of all people about Arab ancestry and events, and pre Islamic history, and Arab poetry.' So the Prophet said, 'That is knowledge which neither harms one who remains ignorant of it nor avails one who knows it.'