عن عائشة رضي الله عنها أن رجلا قال للنبي صلى الله عليه وسلم إن أمي افتلتت نفسها وأظنها لو تكلمت تصدقت فهل لها أجر إن تصدقت عنها قال نعم (صحيح بخاري #1388 صحيح مسلم #1004)

Hazrat ‘Aa’ishah (radhiyallahu ‘anha) narrates that a person asked Nabi (sallallahu ‘alaihi wasallam), “My mother has indeed passed away suddenly (i.e. she did not experience any sickness prior to her death which indicated her death). I feel that if she had spoken (in her final stages), she would have (made a wasiyyat and) given sadaqah. Will she receive the reward of sadaqah if I give it on her behalf?” Rasulullah (sallallahu ‘alaihi wasallam) replied, “Yes.”