Sahih Muslim 2692
صحيح مسلم#2692SahihA'isha (Allah be pleased with her) reported Allah's Messenger (ﷺ) as saying:If anyone dies in a state (that he had to complete) some fasts, his heir must fast on his behalf
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 13:198