Riyad as-SalihinChapter 18Hadith 1179
Full Sharh — Riyad as-Salihin 1179
وعنها رضي الله عنها عن النبي صلى الله عليه وسلم قال: "من مات وعليه صوم، صام عنه وليه" ((متفق عليه)).
English Translation
'Aishah (May Allah be pleased with her) said:: The Prophet (ﷺ) said, "If a person dies without observing Saum (fasts), his Wali should make it up on his behalf.".
Source
Riyad as-Salihin(رياض الصالحين)
The Book of Miscellaneous ahadith of Significant Values
Hadith Number
1179