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Shiavault - a Vault of Shia Islamic Books Greater Sins Volume 3 Thirty-fifth Greater Sin: Eating of Carrion, Pork and Blood The thirty-fifth of Greater sins is consuming carrion, pork and blood and all those things on which Allah (S.w.T.)’s name has not been invoked during its slaughter as reported by Amash from Imam Ja’far as-Sadiq (a.s.) and Fazl ibn Shazān from Imam ‘Ali Riďa (a.s.).
This fact is also mentioned in the Qur’an in Surah al-Baqarah Verse 173, Surah al-An’ām Verse 145 and Surah an-Nahl Verse 116.
In Surah al-Mā’ida Verse 3 Allah (S.w.T.) says, “Forbidden to you is that which dies of itself, and blood, and flesh of swine, and that on which any other name than that of Allah has been invoked, and the strangled (animal) and that beaten to death, and that killed by a fall and that killed by being smitten with the horn, and that which wild beast have eaten, except what you slaughter, and what is sacrificed on stones set up (for idols) and that you divide by the arrows; that is a transgression.” ( Surah al-Mā’ida 5:3) Carrion Every animal that dies without the proper religious procedure is Carrion and eating of it is prohibited.
If it has warm blood then it would also be Najis (ritually impure), but if it is properly slaughtered it is pure and clean (except dog and pig which will be always Najis and never considered clean and pure). In a compilation of Anjuman al-Tablighāt Islami it is mentioned that Islamic Jurisprudence has specified and discussed in detail and prescribed the animals whose flesh is allowed. Only an expert in Life science could fully appreciate justification on which these laws are based.
Islam has prohibited the flesh of all carnivorous animals because there is dirt in the stomachs of such animals. The flesh is dirty and smelly and its consumption causes illness. On the other hand herbivorous animals are mostly considered permissible. Animals having claws are considered Harām and hoofed animals are mostly considered Halāl though some are considered as Makruh (unpleasant) such as Horse, Ass etc.
Birds that flap their wings more and glide less while flying are Halāl and those who glide more and flap their wings less are Harām . Islam has also prescribed rules for hunting. Hunting is permissible for hunters who hunt to feed their family or for their sustenance. Hunting is not allowed for fun and entertainment.