Sunan An-Nasa'i

It was narrated that Ibn Al-Hawtakiyyah said:""Ubayy said: 'A Bedouin came to the Messenger of Allah, and he had a rabbit that he had grilled and some bread. He placed it before the Prophet then he said: ""I found it bleeding."" The Messenger of Allah said to his Companions: ""It doesn't matter; eat."" And he said to the Bedouin: ""Eat,"" He said: ""I am fasting."" He said: ""If you want to fast then you should fast the shining days of Al-Bid: The thirteenth, fourteenth and fifteenth