It was narrated that Anas bin Malik said: "The Messenger of Allah said: 'May Allah cause to flourish a slave (of His) who hears my words and understands them, then he conveys them from me. There are those who have knowledge but no understanding, and there may be those who convey knowledge to those who may have more understanding of it than they do.'"

It was narrated that Anas bin Malik said: "The Messenger of Allah said: 'Some people open the door to good and close the door to evil, and some people open the door to evil and close the door to good. Glad tidings to those in whose hands Allah places they keys to good, and woe to those in whose hands Allah places the keys to evil.'"

It was narrated from Sahl bin Sa'd that: The Messenger of Allah said: "This goodness contains many treasures, and for those there are keys. So glad tidings to the one whom Allah makes a key to good and a lock for evil, and woe to the one whom Allah makes a key to evil and a lock to good."

It was narrated that Abu Dharr said: "I heard the Messenger of Allah say: 'Everyone in the universe, in the heavens and on earth, prays for forgiveness for the scholar, even the fish in the sea."

Sahl bin Mu'adh bin Anas narrated from his father that: The Prophet said: "Whoever teaches some knowledge will have the reward of the one who acts upon it, without that detracting from his reward in the slightest."

'Abdullah bin Abu Qatadah narrated that his father said: "The Messenger of Allah said: 'The best things that a man can leave behind are three: A righteous son who will pray for him, ongoing charity whose reward will reach him, and knowledge which is acted upon after his death.'" (Hasan) Another chain with similar wording.

It was narrated that Abu Hurairah said: "The Messenger of Allah said: 'The rewards of the good deeds that will reach a believer after his death are: Knowledge which he taught and spread; a righteous son whom he leaves behind; a copy of the Qur'an that he leaves as a legacy; a mosque that he built; a house that he built for wayfarers; a canal that he dug; or charity that he gave during his lifetime when he was in good health. These deeds will reach him after his death.'"

It was narrated from Abu Hurairah that: The Prophet said: "The best of charity is when a Muslim man gains knowledge, then he teaches it to his Muslim brother."

It was narrated from Shu'aib bin 'Abdullah bin 'Amr that his father said: "The Messenger of Allah was never seen eating while reclining or making two men walk behind him." (Sahih) Other chains with the same meanings.