Narrated `Aisha: Allah's Apostle said, "Whoever died and he ought to have fasted (the missed days of Ramadan) then his guardians must fast on his behalf."
Hadith Referenceصحيح البخاري / كتاب الصوم / 1952
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة