أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ سَعِيدٍ ، حَدَّثَنَا أَبُو خَالِدٍ الْأَحْمَرُ ، عَنْ عَمْرِو بْنِ قَيْسٍ ، عَنْ أَبِي إِسْحَاق ، عَنْ صِلَةَ ، قَالَ : كُنَّا عِنْدَ عَمَّارِ بْنِ يَاسِرٍ، فَأُتِيَ بِشَاةٍ مَصْلِيَّةٍ، فَقَالَ : كُلُوا، فَتَنَحَّى بَعْضُ الْقَوْمِ، فَقَالَ : إِنِّي صَائِمٌ.
فَقَالَ عَمَّارُ بْنُ يَاسِرٍ :" مَنْ صَامَ الْيَوْمَ الَّذِي يُشَكُّ فِيهِ، فَقَدْ عَصَى أَبَا الْقَاسِمِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ "

Abdullah bin Saeed told us, Abu Khaled Al-Ahmar told us, on the authority of Amr bin Qais, on the authority of Abu Ishaq, on the authority of Silah, he said: We were With Ammar bin Yasser, he brought a praying sheep and said: Eat. Then some of the people moved away and said: I am fasting.
Ammar bin Yasser said: “Whoever fasts on the day of which there is doubt, has disobeyed Abu Al-Qasim, may God bless him and grant him peace.”