It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that Jibril (peace be upon him) came to the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) asked him: "O Jibril, how did you find our Eid?" He said: "The inhabitants of the heaven took pride in it. Know, O Muhammad, that a six-month-old lamb (jadha') of sheep is better than the chief (the best full-grown) of goats; and a young lamb is better than the chief of cattle; and a young lamb is better than the chief of camels. And had Allah Almighty known of a sacrifice better than it, He would have ransomed Ibrahim (peace be upon him) with it." This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna al-Bara' bin Azib (may Allah be pleased with him) that a man said to him: "We dislike a defect in the horn and the ear." Al-Bara' (may Allah be pleased with him) said: "Dislike for yourself whatever you wish, but do not make it unlawful for people." Al-Bara' (may Allah be pleased with him) said: the Messenger of Allah (peace and blessings be upon him) said: "Four (kinds of animals) are not acceptable as sacrifices: the one-eyed animal whose loss of an eye is evident, the animal with one of its legs broken whose break is evident, the sick animal whose sickness is evident, and the emaciated animal that has no marrow left in its bones."

It is narrated from Sayyiduna al-Bara' bin Azib (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said the same. Al-Rabi' said: In my book, in both chains, it reads: "al-Awza'i narrated to us." The narration of Abu Salamah from al-Bara' bin Azib has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it. Imam Muslim (may Allah have mercy on him) recorded the hadith of al-Bara' through the narration of Sulayman bin Abd al-Rahman from Ubayd bin Fayruz, and it is among what was criticised against Muslim (may Allah have mercy on him) due to the disagreement of the transmitters regarding it. The most authentic of them is the narration of Yahya bin Abi Kathir from Abu Salamah, provided it is free (of error) from Ayyub bin Suwayd.

It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that a man came to the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) said to him: "I have been commanded to celebrate the Day of Adha as an Eid, which Allah has appointed for this Ummah." The man said: (O Messenger of Allah!) If I have nothing except my son's maniha (a milch camel lent for its milk), or the goat of myself and my family, should I slaughter it? He (peace and blessings be upon him) said: "No; rather (instead of that), trim your nails, cut your moustache and shave your pubic hair. That is your complete sacrifice with Allah, the Mighty and Majestic." This hadith has an authentic chain (sahih al-isnad), but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) forbade sacrificing an animal whose horn or ear is broken off or cut off from the root. Qatadah said: I mentioned this to Sa'id bin al-Musayyab, and he said: 'Adab means half or more than that (broken or cut off). This hadith has an authentic chain (sahih al-isnad), but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) forbade sacrificing an animal whose ear is cut at the front (muqabalah), or cut at the back (mudabarah), or split lengthwise (sharqa'), or has a round hole in it (kharqa'), or whose ear is cut off from the root (jad'a'). This hadith has an authentic chain (sahih al-isnad), but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) commanded us to examine the eye and the ear (of the sacrificial animal) carefully, and not to sacrifice an animal whose ear is cut at the front, or cut at the back, or split, or has a hole in it. Abu Ishaq explained that muqabalah is one whose ear has its tip cut off, mudabarah is one from the side of whose ear something has been cut, sharqa' is one with a split ear, and kharqa' is one with a pierced ear. All the chains of this hadith are sahih (authentic), but the two Shaykhs (Bukhari and Muslim) did not record it. My assumption is that this is due to an addition in the narration of Qays bin al-Rabi' from Abu Ishaq, although the two Shaykhs did not use Qays as evidence.

It is narrated similarly from Sayyiduna Ali bin Abi Talib (may Allah be pleased with him). Qays said: I asked Abu Ishaq: Did you hear it from Shurayh? He replied: Ibn Ashwa' narrated this hadith to me from him.

It is narrated from Hujayyah bin Adi that a man asked Sayyiduna Ali (may Allah be pleased with him) about a cow, and he said: It is (sufficient) on behalf of seven people. He asked: What if its horn is (broken)? He said: That will not harm you. He asked: What if it is lame? He said: If it reaches the place of slaughter by walking (then it is permissible). And he further said that the Messenger of Allah (peace and blessings be upon him) had commanded us to examine the eye and the ear (of the sacrificial animal) carefully.

It is narrated from Hujayyah bin Adi that a man asked Sayyiduna Ali (may Allah be pleased with him) about sacrificing a cow, and he said: It is on behalf of seven people. He asked: What if its horn is broken? He said: There is no harm. He asked: What if it is lame? He said: If it reaches the place of sacrifice. And he said: The Messenger of Allah (peace and blessings be upon him) commanded us to examine the eye and the ear carefully.