(15) باب وُصُولِ ثَوَابِ الصَّدَقَةِ عَنِ الْمَيِّتِ، إِلَيْهِ
'A'isha said that a person came to the Messenger of Allah (ﷺ) and said:
My mother died suddenly without having made any will. I think she would have definitely given Sadaqa if she had been able to speak. Would she have a reward if I gave Sadaqa on her behalf? He (the Holy Prophet) said: Yes.
Reference: Sahih Muslim 1004 a
In-book reference: Book 12, Hadith 63
USC-MSA web (English) reference(deprecated numbering scheme): Book 5, Hadith 2196