In the name of Allah, Most Gracious, Most Merciful.
Narrated by Abu-Huraira (may Allah be pleased with him): ‘Allah’s Messenger (May Allah exalt his mention and protect him from imperfection) said: “When the son of Adam dies no further reward is recorded for his actions, with three exceptions: charity whose benefit is continuous, knowledge from which benefit continues to be reaped, or the supplication of a righteous son (for him).”‘ (Muslim)
Riyaadiss-Saliheen (The Meadows of the Righteous) (Abridged)
By Imam An Nawawi Vol. (2)
Publisher: Dar Al-Manarah
Chapter 151, Page 653, Number 486