Narrated Aishah: The Prophet صلی اللہ علیہ وسلم as saying: If anyone dies when some fast due from him has been unfulfilled, his heir must fast on his behalf.

Narrated Aishah: The Prophet صلی اللہ علیہ وسلم as saying: If anyone dies when some fast is due from him (i. e. which he could not keep) his heir must fast on his behalf. Abu Dawud said: This applies to the fast which a man vows ; and this is the opinion of Ahmad bin Hanbal.

Narrated Abdullah ibn Abbas: A woman made a voyage and vowed that she would fast one month if Allah made her reach her destination with peace and security. Allah made her reach her destination with security but she died before she could fast. Her daughter or sister (the narrator doubted) came to the Messenger of Allah صلی اللہ علیہ وسلم . So he commanded to fast on her behalf.