Bulugh al-Maram #759
Fasting
’Ammar bin Yasir (RAA) narrated, ‘Whoever fasts the day of doubt he has then disobeyed Abu al-Qasim (the Prophet).’ Related by the five Imams, and Ibn Khuzaimah and Ibn Hibban graded it as Sahih
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About Bulugh al-Maram
This hadith is #759 from Bulugh al-Maram, in the Book of Fasting. Bulugh al-Maram contains 1,767 hadiths across 16 books.