Narrated 'Aishah (RA):

A man came to the Prophet (ﷺ) and said, "O Allah's Messenger (ﷺ) , my mother had died suddenly, and did not make a will. And I think she would have given out Sadaqah if she had been able to speak, so will she get a reward if I gave out Sadaqah on her behalf?" He replied, "Yes." [Agreed upon; the wording is Muslim's].

وَعَنْ عَائِشَةَ ‏-رَضِيَ اَللَّهُ عَنْهَا‏- { أَنَّ رَجُلاً أَتَى اَلنَّبِيَّ ‏- صلى الله عليه وسلم ‏-قَالَ: يَا رَسُولَ اَللَّهِ ! إِنَّ أُمِّي اُفْتُلِتَتْ نَفْسُهَا وَلَمْ تُوصِ , وَأَظُنُّهَا لَوْ تَكَلَّمَتْ تَصَدَّقَتْ , أَفَلَهَا أَجْرٌ إِنْ تَصَدَّقْتُ عَنْهَا ? قَالَ : " نَعَمْ } مُتَّفَقٌ عَلَيْهِ , وَاللَّفْظُ لِمُسْلِمٍ [1]‏ .‏