A woman came to the Messenger of Allah (ﷺ) and said: Messenger of Allah, my mother has died and there is due from her a fast of vow; should I fast on her behalf? Thereupon he said: You see that if your mother had died in debt, would it not have been paid on her behalf? She said: Yes. He (the Holy Prophet) said: Then observe fast on behalf of your mother.
Reference: Sahih Muslim 1148 d In-book : Book 13, Hadith 202 USC-MSA web (English) : Book 6, Hadith 2557 (deprecated)
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