"Umar, May Allah be pleased with us on the day when we stopped at Al-Qaha?' Abu Dharr said: 'I was. A rabbit was brought to the Messenger Allah and the man who brought it said: I saw it bleeding (menstruating). The Prophet did not eat, then he said: "Eat." A man said: "I am fasting." He said: "What fast are you observing?" He said: "Three days each month" He said: "Why don't yo0u fast the bright shining days, the thirteenth, fourteenth and fifteenth."'  

عُمَرُ ؓ مَنْ حَاضِرُنَا يَوْمَ الْقَاحَةِ قَالَ قَالَ أَبُو ذَرٍّ أَنَا أُتِيَ رَسُولُ اللَّهِ ﷺ بِأَرْنَبٍ فَقَالَ الرَّجُلُ الَّذِي جَاءَ بِهَا إِنِّي رَأَيْتُهَا تَدْمَى فَكَانَ النَّبِيُّ ﷺ لَمْ يَأْكُلْ ثُمَّ إِنَّهُ قَالَ كُلُوا فَقَالَ رَجُلٌ إِنِّي صَائِمٌ قَالَ وَمَا صَوْمُكَ قَالَ مِنْ كُلِّ شَهْرٍ ثَلاَثَةُ أَيَّامٍ قَالَ فَأَيْنَ أَنْتَ عَنِ الْبِيضِ الْغُرِّ ثَلاَثَ عَشْرَةَ وَأَرْبَعَ عَشْرَةَ وَخَمْسَ عَشْرَةَ  

a man brought a rabbit to the Prophet, and the prophet stretched out his hand toward it, then the one who had brought it said: "I saw some blood on it," So the Prophet drew his hand back, but he told the people to eat. Among the people there was a man who held back. The Prophet said: "What is the matter with you?" He said: "I am fasting." The Prophet said to him: "Why don't you fast on the three days of Al-Bid, the thirteenth, fourteenth and fifteenth?"  

أَنَّ رَجُلاً أَتَى النَّبِيَّ ﷺ بِأَرْنَبٍ وَكَانَ النَّبِيُّ ﷺ مَدَّ يَدَهُ إِلَيْهَا فَقَالَ الَّذِي جَاءَ بِهَا إِنِّي رَأَيْتُ بِهَا دَمًا فَكَفَّ رَسُولُ اللَّهِ ﷺ يَدَهُ وَأَمَرَ الْقَوْمَ أَنْ يَأْكُلُوا وَكَانَ فِي الْقَوْمِ رَجُلٌ مُنْتَبِذٌ فَقَالَ النَّبِيُّ ﷺ مَا لَكَ قَالَ إِنِّي صَائِمٌ فَقَالَ لَهُ النَّبِيُّ ﷺ فَهَلاَّ ثَلاَثَ الْبِيضِ ثَلاَثَ عَشْرَةَ وَأَرْبَعَ عَشْرَةَ وَخَمْسَ عَشْرَةَ