(22) The Book of Fasting
كتاب الصيام
(37) Chapter: Fasting on the day of Doubt
(37) باب صِيَامِ يَوْمِ الشَّكِّ ‏‏
Sunan an-Nasa'i 2188 
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."' '
أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ سَعِيدٍ الأَشَجُّ، عَنْ أَبِي خَالِدٍ، عَنْ عَمْرِو بْنِ قَيْسٍ، عَنْ أَبِي إِسْحَاقَ، عَنْ صِلَةَ، قَالَ كُنَّا عِنْدَ عَمَّارٍ فَأُتِيَ بِشَاةٍ مَصْلِيَّةٍ فَقَالَ كُلُوا ‏.‏ فَتَنَحَّى بَعْضُ الْقَوْمِ قَالَ إِنِّي صَائِمٌ ‏.‏ فَقَالَ عَمَّارٌ مَنْ صَامَ الْيَوْمَ الَّذِي يُشَكُّ فِيهِ فَقَدْ عَصَى أَبَا الْقَاسِمِ صلى الله عليه وسلم ‏.‏
Grade :  Sahih (Darussalam)
Reference : Sunan an-Nasa'i 2188
In-book reference : Book 22, Hadith 99
English translation : Vol. 3, Book 22, Hadith 2190