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Pork (pig meat) is forbidden as many times in the Quran as blood is (2:173, 5:3, 6:145, 16:115). Under that, I'd assume that blood is just as forbidden as pork.

However, Muslims are very picky about whether food contains traces of pig DNA or pig hairs (which is not explicitly forbidden in the Quran). They are not as picky with something such as blood, even though quite a lot of blood is commonly found in halal food.

Why is this? Is there a hadith that emphasizes how forbidden pork is? Is there something detailing that blood is allowed in smaller quantities?

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According to Shi'ite Islamic jurisprudence (fiqh) if an animal whose meat is permissible to eat is slaughtered Islamically the following applies:

  • If the body is emptied of a normal amount of blood and some blood is left in the body (which is normal when slaughtering an animal) the remaining blood is considered pure.

  • But if less then normal amount of blood leaves the body or if the blood that has left the body is put back, that blood is impure.

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Would be great if you have a citation for this, even if it's in another language. – Muz Feb 13 '13 at 5:09

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