Sunan Abi Dawud 3311
سنن أبي داود#3311SahihNarrated 'Aishah:The Prophet (ﷺ) as saying: If anyone dies when some fast due from him has been unfulfilled, 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:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiSahih Bukhari (1952) Sahih Muslim (1147)
In-book reference: 22:70