It was narrated that Abu Hurairah said:

"A man came to the Prophet, who encouraged the people to give charity to him. A man said: 'I have such and such,' and there was no one left in that gathering who did not give him something in charity, to a greater or lesser extent. The Messenger of Allah said: 'Whoever initiates a good practice that…

'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 ca…

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."