The Quran lays down the fundamental principles governing the consumption of meat, establishing a clear distinction between what is permissible and what is forbidden. Central to this distinction is the invocation of Allah’s Name over the animal during slaughter. Believers are commanded to eat of that over which the Name of Allah has been mentioned, reinforcing the idea that life, and its taking, is by divine permission and should be acknowledged as such. This divine permission contrasts sharply with practices that do not recognize God, as indicated by the prohibition against eating that over which the Name of Allah has not been mentioned.

Furthermore, the Quran explicitly enumerates the categories of meat that are forbidden. It states, Forbidden to you are carrion, blood, the flesh of swine, and that on which any other name than Allah's has been invoked. This verse, among others, forms the bedrock of halal dietary laws. Carrion (animals that die naturally), flowing blood, and pork are inherently prohibited. Crucially, any animal slaughtered in the name of idols or other deities is also forbidden, underscoring the strict monotheistic principle that all acts of worship and reverence, including the taking of life for sustenance, must be exclusively for Allah. This principle is further highlighted by the story of Zaid bin Amr bin Nufail, who, even before the advent of Islam, [refused to eat from it and then said (to the pagans), "I do not eat of what you slaughter on your stonealtars (Ansabs) nor do I eat except that on which Allah's Name has been mentioned on slaughtering"]Bukhari 72:25. His pre-Islamic practice affirmed the inherent spiritual significance of invoking God's name, a practice later affirmed and codified by Islam.

The Quran also clarifies that the specific rituals of sacrifice are part of the religious practices prescribed for various communities throughout history: “for every nation We have appointed a rite that they may mention the name of Allah over what He has provided for them of sacrificial animals”. This demonstrates that the act of ritual slaughter, particularly as an act of devotion, is a recurring theme in divine law, emphasizing gratitude and devotion.

The Sunnah of Prophet Muhammad (peace be upon him) provides the practical elaboration of the Quranic injunctions, detailing the proper methods, timing, and animals for slaughter, especially concerning sacrificial offerings. The Prophet's teachings emphasize both the ritual correctness and the humane treatment of animals.

One of the most frequently reiterated commands concerning ritual slaughter is its timing during Eid al-Adha. The Prophet (peace be upon him) explicitly stated, [The first thing that we should do on this day of ours is to pray and then return to slaughter the sacrifice. So anyone who does so, he acted according to our Sunna]Bukhari 13:14. This established the prayer as a prerequisite for the sacrifice. Numerous hadith corroborate this, with the Prophet repeatedly instructing those who had slaughtered before the Eid prayer to [slaughter another animal in lieu of it]Bukhari 13:34 or that it was [just meat (i.e. not sacrifice)]Bukhari 13:32. This strict adherence to sequence highlights the sacrificial act as a ritual of worship, not merely a meal. However, the Prophet also showed flexibility in certain circumstances, such as for Abu Burda bin Niyar, who had slaughtered before the prayer due to his neighbors' need. The Prophet allowed him to offer a young she-goat, even stating [Sacrifice it in lieu of the first, but it will not be sufficient (as a sacrifice) for anybody else after you]Bukhari 13:14, indicating a specific dispensation rather than a general rule.

The Sunnah also details the type of animals suitable for sacrifice (Hadi or Udhya). Camels and sheep are frequently mentioned, and the Prophet himself [slaughtered seven Budn (camels) while standing, with his own hands. On the day of `Id-ul-Adha he slaughtered (sacrificed) two horned rams, black and white in color]Bukhari 25:190. He also permitted a six-month-old ram as a sacrifice for `Uqba bin 'Amir, and for Abu Burda a young she-goat, indicating that age and species requirements could have specific permissions or exceptions (Bukhari 73:3, 73:5). For Hajj-at-Tamattu`, Ibn `Abbas advised that pilgrims could [slaughter a camel, a cow or a sheep, or you may share the Hadi with the others]Bukhari 25:167. The permission to share in a camel or cow further underscores the communal aspect of sacrifice.

Beyond the major festivals, the Prophet's companions sought guidance on various aspects of slaughter. When asked by some people about meat brought to them where they were unsure if Allah’s Name had been mentioned, the Prophet replied, [Mention the name of Allah and eat it]Bukhari 34:11. This demonstrates a practical approach, trusting the general Muslim practice unless there is clear evidence to the contrary, especially for new converts.

The Prophet’s teachings extend to the practicalities of slaughter, emphasizing both efficacy and humanity. When faced with the possibility of not having knives for slaughter, Rafi` bin Khadij asked the Prophet if they could use reeds. The Prophet replied, [Yes, or you can use what would make blood flow (slaughter) and you can eat what is slaughtered and the Name of Allah is mentioned at the time of slaughtering. But don't use teeth or fingernails (in slaughtering). I will tell you why, as for teeth, they are bones, and fingernails are used by Ethiopians for slaughtering]Bukhari 47:22. This comprehensive instruction provides a crucial principle: any instrument that can effectively cause blood to flow out is permissible, provided Allah's Name is mentioned. The prohibition of teeth and fingernails is justified, with teeth being "bones" and fingernails being "the knife of Ethiopians," indicating a distinction from common, civilizational practices and an emphasis on proper tools.

The method of slaughter for camels (nahr) also received specific guidance. `Abdullah bin `Umar, observing a man who had made his camel sit to slaughter it, corrected him, saying, ["Slaughter it while it is standing with one leg tied up as is the tradition of Muhammad"]Bukhari 25:191. This shows a specific prophetic tradition for larger animals like camels, differing from the dhabh (lying down) for smaller animals.

The principle of mentioning Allah's name at the time of slaughter is paramount. Jundab reported the Prophet saying, [whoever has not yet slaughtered should slaughter the sacrifice mentioning Allah's name on it]Bukhari 13:34. This invocation is not a mere formality but an act of conscious submission and a reminder that life is taken with divine permission.

Hajj rituals include specific requirements for animal sacrifice (Hadi). The Prophet (peace be upon him) clarified that for those performing Hajj al-Qiran (combining Hajj and Umrah), or those whose Hajj was obstructed (like at Hudaibiya), the Ihram (sacred state) could not be exited until the Hadi was slaughtered. Hafsa reported the Prophet saying, [I matted my hair and have garlanded my Hadi. So, I cannot finish my Ihram till I slaughter (my Hadi)]Bukhari 25:203. This highlights the binding nature of the Hadi sacrifice for certain Hajj types.

However, the Prophet also demonstrated flexibility regarding the order of Hajj rituals, including slaughtering. During the Day of Nahr, when pilgrims asked about performing rites like shaving, Rami (throwing pebbles), or Tawaf al-Ifada before or after their prescribed times, the Prophet consistently responded, ["There is no harm"](Bukhari 25:199, 25:200, 25:201, 25:212, 25:213, 25:214, 25:215, 3:25, 3:26, 3:66, 83:43, 83:44). This indicates that while there is an optimal sequence, minor deviations do not invalidate the Hajj, reflecting Islam's emphasis on ease and practicality where possible.

Other forms of slaughter for specific purposes include `Aqiqa, the sacrifice made for a newborn child. Salman bin 'Amir Ad-Dabbi narrated the Prophet (peace be upon him) saying, ["'Aqiqa is to be offered for a (newly born) boy, so slaughter (an animal) for him, and relieve him of his suffering"]Bukhari 71:7. This points to the variety of situations in which animal slaughter holds religious significance beyond sustenance.

The distribution of the sacrificial animal is also guided by the Sunnah. `Ali (may Allah be pleased with him) was ordered by the Prophet to [distribute their meat, skins and covering sheets in charity and not to give anything (of their bodies) to the butcher as wages for slaughtering]Bukhari 25:195. This emphasizes the charitable aspect of sacrifice and ensures that the act of slaughter remains an offering to Allah, not a transaction for profit.

The prohibition of certain animals and methods of slaughter carries broader spiritual and social implications. The Prophet's strong prohibition against eating the meat of domestic donkeys, declaring it ["impure"]Bukhari 72:53, demonstrates that not all animals, even if slaughtered correctly, are permissible. Similarly, the initial incident where companions slaughtered and cooked donkeys, only for the Prophet's announcer to declare, ["Turn the cooking pots upside down"]Bukhari 0:0, shows the immediate and strict enforcement of dietary laws.

The act of slaughter is also tied to defining the boundaries of the Muslim community. The Prophet (peace be upon him) stated, [I have been ordered to fight the people till they say: 'None has the right to be worshipped but Allah.' And if they say so, pray like our prayers, face our Qibla and slaughter as we slaughter, then their blood and property will be sacred to us and we will not interfere with them except legally and their reckoning will be with Allah]Bukhari 8:44. This hadith underscores that accepting the core tenets of Islam, including its unique mode of ritual slaughter, is a defining marker of a Muslim, granting them protection and rights within the Islamic society.

The Prophet's personal example in slaughtering his own sacrifices, as Anas narrated, [Allah's Messenger (ﷺ) offered the prayer on the day of Nahr and then delivered the Khutba and ordered that whoever had slaughtered his sacrifice before the prayer should repeat it, that is, should slaughter another sacrifice]Bukhari 13:33, showcases his direct involvement and leadership in these practices. His compassion was also evident in how he remembered Khadija, his first wife. `Aisha (may Allah be pleased with her) noted that whenever he [slaughtered a sheep, he would send her women-friends a good share of it]Bukhari 63:41, illustrating the social and charitable dimensions of food distribution, especially from sacrifices.

In conclusion, the Islamic practice of slaughter (dhabh and nahr) is a meticulously guided act, rooted deeply in Quranic revelation and extensively elaborated through the Prophet's Sunnah. It encompasses not only dietary regulations but also profound acts of worship, charity, and communal identity. From the mandatory invocation of Allah's Name and the humane methods prescribed, to the specific timings and distributions of sacrificial animals, every aspect reflects a holistic approach that integrates spiritual awareness, ethical considerations, and practical guidance into the very act of sustenance. This comprehensive framework transforms a mundane necessity into a conscious act of devotion, gratitude, and obedience to the Divine.