Hadith #2433 (Sunan al-Nasa'i)
Book: The Book of Fasting
Narrator(s): Abu Nawful bin Aby أبو نوفل بن أبي, al-Aswad bin Shayban al-Sadusi الأسود بن شيبان السدوسي, Amr bin 'Ali bin Bahr al-Bahli عمرو بن علي بن بحر الباهلي

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?”

Source: https://parallelquran.com/hadith/sunan-al-nasai-2433/

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Hadith #2434 (Sunan al-Nasa'i)
Book: The Book of Fasting
Narrator(s): Abu Nawful bin Aby أبو نوفل بن أبي, al-Aswad bin Shayban al-Sadusi الأسود بن شيبان السدوسي, Yazid bin Harun يزيد بن هارون

“A rabbit that a man had grilled was brought to the Prophet and when he offered it to him he said: ‘O Messenger of Allah, I saw some blood on it.” The Messenger of Allah did not eat it, but he said to those who were with him: “Eat; if I felt like it, I would have eaten it.’ There was a man sitting, and the Messenger of Allah said: ‘Come and eat with the people.’ He said: ‘O Messenger of Allah, I am fasting.’ He said: ‘Why don’t you fast Al-Bid?’ He said: ‘What are they?’ He said: “The thirteenth, fourteenth and fifteenth?”‘

Source: https://parallelquran.com/hadith/sunan-al-nasai-2434/