حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا أَبُو خَالِدٍ الأَحْمَرُ، عَنْ عَمْرِو بْنِ قَيْسٍ، عَنْ أَبِي إِسْحَاقَ، عَنْ صِلَةَ بْنِ زُفَرَ، قَالَ كُنَّا عِنْدَ عَمَّارٍ فِي الْيَوْمِ الَّذِي يُشَكُّ فِيهِ فَأُتِيَ بِشَاةٍ فَتَنَحَّى بَعْضُ الْقَوْمِ فَقَالَ عَمَّارٌ مَنْ صَامَ هَذَا الْيَوْمَ فَقَدْ عَصَى أَبَا الْقَاسِمِ ـ صلى الله عليه وسلم ـ ‏.‏

It wasnarrated that Silah bin Zufar said: “We were with ‘Ammar ontheday concerning which there was some doubt. A (roasted) sheep wasbrought and some of the people moved away. ‘Ammar said: ‘Whoeverisfasting on this day has disobeyed Abu Qasim (PBUH).’” Translation Not Available

Book Ref: Sunan Ibn Majah Book 7 Hadith 1645
Web Ref:  Sunan Ibn Majah Vol 1 Book 7 Hadith 1645