Narrated 'Aishah: 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. 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.

Narrated Anas bin Malik: 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.

Narrated Hanash: 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.

Narrated Abu Sa'eed Al-Khudri: The Messenger of Allah (ﷺ) slaughtered a horned male ram of fine pedigree, (around) his mouth was black, and his legs were black, and (around) his eyes was black.

Narrated Al-Bara' bin 'Azib: 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).

Narrated 'Ali bin Abi Talib: The Messenger of Allah (ﷺ) ordered that we check the eyes and ears, and not to slaughter the Muqabalah, nor the Mudabarah, nor the Sharqa', nor the Kharqa'

Narrated Abu Kibash: 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).

Narrated 'Uqbah bin 'Amir: That the Messenger of Allah (ﷺ) gave him sheep to distribute among his Companions as a sacrifice. There remained a young male kid or a young billy goat, so I mentioned that to the Messenger of Allah (ﷺ) and he said: 'Sacrifice it for yourself.' Waki' said: The Jadha' among sheep is seven or six months.

Narrated Ibn 'Abbas: 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.

Narrated Jabir: 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).

Narrated Hujayyah bin 'Adi: 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.'

Narrated 'Ali: 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.'

Narrated 'Ata bin Yasar: 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.

Narrated Jabalah bin Suhaim : 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.

Narrated Ibn 'Umar : The Messenger of Allah (ﷺ) stayed in Al-Madinah for ten years performing the Udhiyah.

Narrated Al-Bara' bin 'Azib : The Messenger of Allah (ﷺ) delivered a sermon to us on the Day of Nahr and he said: 'None of you should slaughter until he performs the Salat. He said: 'So my maternal uncle stood and said: ' O Messenger of Allah, this is the day in which meat is disliked, and I hastened my sacrifice to feed my family and the people of my dwellings - or - 'my neighbors.' He said: 'Repeat your slaughter with another.' He said: 'O Messenger of Allah (ﷺ) I have a she-kid that has better meat than my sheep, should I slaughter it?' He said: 'Yes, and it is better and it will suffice for you, but a Jadha' will not be accepted after you.'

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

Narrated Sulaiman bin Buraidah: From his father that the Messenger of Allah (ﷺ) said: I used to prohibit you from (eating) the meat of Sacrifice beyond three days so that those who have the ability would give to those who do not have it. So (now) eat as you like, feed others, and save from it.

Narrated 'Abis bin Rabi'ah: 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.

Narrated Abu Hurairah: 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.

Narrated Yusuf bin Mahak: 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.

Narrated 'Ubaidullah bin Abi Rafi': 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.

Narrated Salman bin 'Amir Ad-Dabbi : That the Messenger of Allah (ﷺ) said: For a boy, there is an 'Aqiqah. So spill blood for him and remove the harm from him.

Narrated Umm Kurz: That she asked the Messenger of Allah (ﷺ) about the 'Aqiqah. He said: For the boy is two sheep, and for the girl is one, it will not harm you if they (i.e. the sheep) are male or female.

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