al-Laith bin Sa'd الليث بن سعد · The Book on Sacrifices

That the Prophet (ﷺ) said: "None of you should eat from the meat of his sacrificial animal beyond three days."

That his father said: "I saw the Messenger of Allah (ﷺ) say the Adhan in the ear of Al-Hasan bin 'Ali - when he was born to Fatimah - the Adhan of Salat."

That Ali bin Abi Talib said: "The Messenger of Allah (ﷺ) had the 'Aqiqah for Al-Hasan with one sheep, and said: 'O Fatimah! Shave his head and give the weight of his hair in silver as charity.'" He said: "So I weighed it, and it was the weight of a Dirham or a bit of a Dirham."