Three Best Things
The Prophet of Rahmah, the Intercessor of Ummah, the Owner of Jannah (May Peace and blessing of ALLAH be upon him) has 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.
(Sunan Ibn Majah, vol. 1, pp. 157, Hadis 241)