"We were with 'Ammar and a roast sheep was brought and he said: 'Eat.' One of the people turned away and said: 'I am fasting 'Ammar said: Whoever fasts on the day concerning which there is doubt, has disobeyed Abu Al-Qasim."' '
Reference: Sunan an-Nasa'i 2188 In-book : Book 22, Hadith 99 English translation : Vol. 3, Book 22, Hadith 2190
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