Riyad as-Salihin, Book 7, Hadith 948 (In-Book) ⓘ

'Aishah (May Allah be pleased with her) reported: A man said to the Prophet: "My mother has died suddenly. I think that if she were able to talk (alive) she would have given in Sadaqah (charity). So, if I give Sadaqah now on her behalf, will she get the reward?" The Messenger of Allah said, "Yes (she will be rewarded for that)."[Al-Bukhari and Muslim].

وعن عائشة رضي الله عنها أن رجلاً قال للنبي صلى الله عليه وسلم ‏:‏ إن أمي افتلتت نفسها وأراها لو تكلمت، تصدقت، فهل لها أجر إن تصدقت عنها‏؟‏ قال‏:‏ ‏ "‏نعم‏" ‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏