Qutayba bin Sa'id bin Jamil قتيبة بن سعيد بن جميل · The Book on Sacrifices

That 'Ali used to slaughter two male sheep, one for the Prophet (ﷺ) and the other for himself. When this was mentioned to him, he said: "He ordered me to" - meaning the Prophet (ﷺ) - "So I will never leave it."

A Marfu' narration (from the Prophet (ﷺ)), saying: "A crippled animal whose limp is obvious is not to be slaughtered as sacrifice, nor an animal with a bad eye whose blindness is obvious, nor a sick animal whose sickness is obvious, nor an emaciated animal that has no marrow (in its bones)."

"I brought a Jadha' sheep to Al-Madinah (for sale) but it remained with me. I saw Abu Hurairah and I asked him about it, so he said: 'I heard the Messenger of Allah (ﷺ) saying: "The best male" - or - "female Udhiyah is that from the Jadha' sheep." He said: "So the people took note of that (they became interested in buying)."

"We were with the Messenger of Allah (ﷺ) on a journey when the (Day of) Adha came, so we shared seven for a cow and ten for a camel."

"Ali said: 'A cow is for seven.' I said: "And if it gives birth?' He said: 'Then slaughter its offspring with it.' I said: 'What if it is lame?' He said: 'When it has reached the place of ritual.' I said: 'What if it has a broken horn?' He said: 'There is no harm, we were ordered' - or - 'The Messenger of Allah (ﷺ) ordered us, to check the two eyes and the two ears.'"

That a man asked Ibn 'Umar about the Udhiyah, "Is it obligatory?" So he said: "The Messenger of Allah (ﷺ) performed the Udhiyah as did the Muslims." He repeated the question. So he said: "Do you understand ?" The Messenger of Allah (ﷺ) slaughtered as did the Muslims."

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."

"We were standing with the Prophet (ﷺ) at 'Arafat when I heard him say: 'O you people! For every household each year is Udhiyah (sacrifice) and 'Atirah. Do you know what an 'Atirah is ? It is that which you call Ar-Rajabiyyah.'"

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."

That the Prophet (ﷺ) said: "Whoever sees the crescent of Dhul-Hijjah, and wants to slaughter a sacrifice he should not take from his hair nor from his nails."