Islamic dietary laws  Islamic jurisprudence specifies which foods are (, "lawful") and which are (, "unlawful"). This is derived from commandments found in the Qur'an, the holy book of Islam, as well as the Hadith and Sunnah, libraries cataloging things the prophet Muhammad is reported to have said and done. Extensions of these rulings are issued, as fatwas, by mujtahids, with varying degrees of strictness, but they are not always widely held to be authoritative. According to the Quran, the only foods explicitly forbidden are meat from animals that die of themselves, blood, the meat of pigs and any food dedicated to other than God. However, a person would not be guilty of sin in a situation where the lack of any alternative creates an undesired necessity to consume that which is otherwise unlawful. (Quran 2:173) This is the "law of necessity" in Islamic jurisprudence: "That which is necessary makes the forbidden permissible." Quranic verses which have information regarding halal foods include: 2:173, 5:5, and 6:118–119, 121. A variety of substances are considered as unlawful (haram) for humans to consume and, therefore, forbidden as per various Qurʼanic verses:  The Qur'an in several verses admonishes the consumption of alcohol "khamr":  At first, it was forbidden for Muslims to attend prayers while intoxicated. In addition to this, most observant Muslims refrain from consuming food products that contain pure vanilla extract or soy sauce, as these food products may contain alcohol. There is some debate about whether the prohibition extends to dishes in which the alcohol would be cooked off or if it would be practically impossible to consume enough of the food to become intoxicated. Substances which are intoxicants are not prohibited as such, although their consumption is. For example, alcohol can be used as a disinfectant or for cleaning, but not as a beverage. The Alevi Muslims of Turkey permit alcohol, unlike many other denominations. The Zaidi and Mutazili sects believe that the use of alcohol has always been forbidden and refer to the Qur'an Ayah (4:43) as feeling of sleepiness and not to be awake. A fatwa issued in November 2015 permitted the consumption of low-alcohol and non-alcoholic beverages provided that the given beverage contains an amount of 0.5% or the like of alcohol does not entail deeming its consumption unlawful as long as there is no effect of the alcohol upon consumption of the beverage and it does not intoxicate in large quantities.