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.