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."

"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)."

"The Messenger of Allah (ﷺ) stayed in Al-Madinah for ten years performing the Udhiyah.

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

"I said to the Mother of the Believers: 'Did the Messenger of Allah (ﷺ) prohibit from the meat of the sacrifice?' She said: 'No, but only a few people could slaughter, so he liked that they feed those who did not slaughter. (Later) we would store a leg to eat after ten days."

That the Messenger of Allah (ﷺ) said: "The best of Udhiyah (sacrifice) is a ram, and the best (burial) shroud is the Hullah."

"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."

Another chain with similar meaning.

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."

"I asked Abu Abyub [Al-Ansari] how the slaughtering was done during the time of the Messenger of Allah (ﷺ). He said: 'A man would sacrifice a sheep for himself and the people in his household. They would eat from it and feed others, until the people (later) would boast about it and it became as you see now."

That the Messenger of Allah (ﷺ) said: "There is no Fara' or 'Atirah."The Fara' is the first of the offspring that would be born to them, so they would slaughter it.The 'Atirah was an animal that they would slaughter during Rajab to honor the month of Rajab, since it was the first of the sacred months.

They entered upon Hafsah bint 'Abdur-Rahman to ask her about the 'Aqiqah. She informed them that 'Aishah had informed her, that the Messenger of Allah (ﷺ) ordered them that for a boy, two sheep were sufficient, and for a girl one sheep.

That the Messenger of Allah (ﷺ) said: "A human does no action from the actions on the day of Nahr more beloved to Allah then spilling blood (of sacrificial animals). On the Day of Judgement, it will appear with its horns, and hair, and hooves, and indeed the blood will be accepted by Allah from where it is received before it even falls upon earth, so let your heart delight in it."

"The Messenger of Allah (ﷺ) slaughtered two horned male sheep which were mostly white. He slaughtered them with his hand and mentioned Allah's Name, and he said 'Allahu Akbar', and put his foot on their side."

Another chain from the Prophet (ﷺ) with similar meaning.

"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."

"We performed the Nahr (sacrifice) with the Messenger of Allah (ﷺ) at Al-Hudaibiyyah: A camel for seven (persons) and a cow for seven (persons)."

"The Messenger of Allah (ﷺ) prohibited that an animal with a A'dab (stump) horn or ear should be slaughtered as a sacrifice." Qatadah (one of the narrators) said: "So I mentioned this to Sa'eed bin Al-Musayyab and he said: 'The A'dab is that which equals or more than that.'"