أَخْبَرَنَا مُحَمَّدُ بْنُ مَعْمَرٍ الْبَحْرَانِيُّ، قَالَ حَدَّثَنَا حَبَّانُ، - وَهُوَ ابْنُ هِلاَلٍ قَالَ حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ عَبْدِ الْمَلِكِ بْنِ عُمَيْرٍ، عَنْ مُوسَى بْنِ طَلْحَةَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ جَاءَ أَعْرَابِيٌّ إِلَى النَّبِيِّ صلى الله عليه وسلم بِأَرْنَبٍ قَدْ شَوَاهَا فَوَضَعَهَا بَيْنَ يَدَيْهِ فَأَمْسَكَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَلَمْ يَأْكُلْ وَأَمَرَ الْقَوْمَ أَنْ يَأْكُلُوا وَأَمْسَكَ الأَعْرَابِيُّ فَقَالَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَا يَمْنَعُكَ أَنْ تَأْكُلَ " . قَالَ إِنِّي أَصُومُ ثَلاَثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ . قَالَ " إِنْ كُنْتَ صَائِمًا فَصُمِ الْغُرَّ " .
It was narrated that Abu Hurairah said: "A Bedouin brought a rabbit to the Messenger of Allah that he had grilled and placed it before him. The me4ssenger of Allah refrained form eating but he told the people to eat. The Bedouin also refrained from eating, and the Mesenger of Allah said to him: 'What is keeping you from eating?" He said: 'I fast three days of e4ach month." He Said: 'If you are going to fast, then fast the bright days (Al-Ghurr)." Translation Not Available
Book Ref: Sunan An Nisai Book 42 Hadith 4310
Web Ref: Sunan An Nisai Vol 5 Book 42 Hadith 4315