It is narrated from Hajjaj al-Aswad that Wahb bin Munabbih said: In the past, the people of knowledge used to protect their knowledge from the people of the world, so the people of the world were eager for their knowledge and would lavish their worldly possessions upon them. But today, the people of knowledge have lavished their knowledge upon the people of the world, so the people of the world have turned away from their knowledge and have protected their worldly possessions from them.