So whoever does an atom’s weight of good will see it, and whoever does an atom’s weight of evil will see it.
Az-Zalzalah (7-8).
When a man dies, his acts come to an end, but three, recurring charity, or knowledge (by which people) benefit, or a pious son, who prays for him (for the deceased).
Sahih Muslim (1631), Al-Nasa’i (3651), Al-Tirmizi (1376) and Abu Daud (2880).