(37) باب صِيَامِ يَوْمِ الشَّكِّ
It was narrated that Silah said:
"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 reference: Book 22, Hadith 99
English translation: Vol. 3, Book 22, Hadith 2190