By killing is meant the killing of a harmful animal, or the killing of a murderer as retribution and the killing of the enemy in the battlefield. All these situations warrant killing but with a stress on moderation, thanks to Islamic teachings. A believer is told not to let his passions of enmity go wild, and even an enemy or a criminal ought not to be put to a torturous death. In the Pre-Islamic Period of Ignorance it was a prevalent practice that the limbs of a victim were mutilated before he was finally killed. Islam has forcefully forbidden this inhuman custom, stating that the victim should be beheaded with the one swing of sword. Similarly, there are specific instructions regarding an animal's slaughter. First, the knife should be sharpened. Second, the animal must not be slaughtered from its nape, because in both ways it will suffer pain. This Shari`ah rule ensures quick death of the animal. In modern Europe, an animal is slaughtered with one stroke of a cutting-machine. Apparently this method seems to be easy and smooth, yet in this way the animal's blood doesn't flow out from its body completely. So the consumption of the meat of such a kill is injurious to human health. Due to this reason, Islam considers the discharge of blood as a prerequisite to Halal (lawful). Certainly, only the Islamic way of slaughtering an animal is more sound, scientific and wholesome.