[1][2][3] The word is found neither in the Quran nor in the ḥadīth literature; instead, kufr ("unbelief") and kāfir ("unbeliever") and other terms employing the same triliteral root K-F-R appear.
[4] Since according to the traditional interpretations of Islamic law (sharīʿa) the punishment for apostasy is the death penalty,[3] and potentially a cause of strife and violence within the Muslim community (Ummah),[5] an ill-founded takfir accusation was a major forbidden act (haram) in Islamic jurisprudence,[6] with one hadith declaring that one who wrongly declares a Muslim an unbeliever is himself not an apostate but rather committed minor shirk.
[3][10] This radical Islamist ideology, called "takfirism", has been widely held and applied by numerous Islamic extremists, terrorists, and jihadist organizations in the late 20th and early 21st-centuries, to varying degrees.
[10][13][14] Some Salafi jihadist insurgent organizations such as Takfir wal-Hijra, GIA, Boko Haram,[10][13] and the Islamic State,[3][10] have been engaged in radical Takfiri discourse.
[5] This is due to the fact that takfir that successfully convinces the judges (or Muslim vigilantes) of the accused being an apostate, traditionally leads to punishments of killing, confiscation of their property, and denial of Islamic burial.
[17] Ulamas often raise objections by asking rhetorical questions of who holds the right to excommunicate others, on what religious criteria it should be based, and what level of specialized knowledge in Islamic jurisprudence (fiqh) is required for the qualification of authority.
The manuals Reliance of the Traveller, a 14th-century manual of the Shafi'i school of jurisprudence (Fiqh),[24][25] and Madjma' al-Anhur by Hanafi scholar Shaykhzadeh (d. 1667)[26] include (From Reliance): (Selected characteristics from Madjma' al-anhur): Other examples from legal treatises devoted exclusively to verbal expressions (but also actions) of disbelief (known as alfaz al-kufr) included: Al-Ghazali held that apostasy occurs when a Muslim denies the essential dogmas: monotheism, Muhammad's prophecy, and the Last Judgment.
[28] He devoted "chapters to dealing with takfir and the reasons for which one can be accused of unbelief," in his work Fayasl al-tafriqa bayn al-Islam wa-l-zandaqa.
"[32] In contrast to the manuals described above, Charles Adams and A. Kevin Reinhart state that some Islamic theologians maintain that Muslims may be guilty of error and wrongdoing without descending all the way to the level of kafir.
For example, a Muslim denying a point of creed may be a hypocrite (munāfiq) but not a kāfir; merely corrupt (fasād) if their disobedience was not excessive; "errant Muslim sectarians ... astray (ḍāll),"; those whose Qurʿānic interpretation (taʿwīl) are faulty are in error and not unbelievers because their "citation of Qurʿān, however mistaken, established their faith"; and "according to some", anyone who is "a person of qiblah" [prays towards the qiblah] cannot be a kāfir.
[33] Compensating for the numerous and potentially fatal possible transgressions mentioned above that had to be avoided were the requirements ("hurdles to jump through") for finding a Muslim guilty of apostasy.
[36][need quotation to verify] In contrast, Hanafi, Hanbali and Ja'fari fiqh set no such screening requirements; a Muslim's history has no bearing on when and on whom to apply the sharia code for apostasy.
[46] It emerged as a theological school that was opposed to the Kharijites on questions related to early controversies regarding sin and definitions of what is a true Muslim.
[53] Some Muslims (such as Muhammad Ibn Abd al-Wahhab, founder of Wahhabism) believe that one of the earliest examples of takfir was alleged to have been practised by the first Caliph, Abu Bakr.
[citation needed] In the Umayyad and early Abbasid periods (roughly 661–800 CE), authorities "appear" to have defended Islam against apostasy "mostly" with "intellectual debates".
These individuals included Sufis, Rafidi, Shi'a, reverts from Islam, "alleged blasphemers and sorcerers, rebels, political rivals and others, with charges often being trumped up.
[70]Ibn Abd al-Wahhab's interpretation of Islam (aka Wahhabism) became enormously influential throughout the Muslim world starting in the late 20th century, thanks in large part to the financial power of Saudi Arabia which spent tens of billions of dollars to propagate his movement.
Timani states that Muslim scholars blame this on "the decline of Islamic values and the loss of solidarity among the people after centuries of colonialism and foreign domination".
[72] Takfir has become "a central ideology of militant groups" such as those in Egypt, "which reflect the ideas" of Sayyid Qutb, Abul A'la Maududi and others, according to the Oxford Islamic Studies Online website.
Al-Farida al-gha'iba (The Neglected Duty) by Muhammad abd-al-Salam Faraj the theorist of the group (Tanzim al-Jihad movement), proclaimed that jihad would enable Muslims to rule the world and to reestablish the caliphate,[83] but the document explained that the specific reason Sadat had to be killed was that his government (along with all Muslim majority country governments) did not rule according to sharia.
Rushdie went into hiding after Ayatollah Khomeini issued a fatwa in 1989, officially declaring him a kafir who should be executed for his book The Satanic Verses, which is perceived by many Muslims to contain passages that draw into question the basis of Islam.
Similar cases have occurred in Egypt: for example, Nasr Abu Zayd was accused of apostasy following his work on Islamic sources, describing the Qur'an as a historical document.
The massacres continued for months and culminated in August and September when hundreds of men women and children were killed in the villages of Rais, Bentalha and Beni Messous.
[89] The GIA issued a communiqué signed by Zouabri claiming responsibility for the massacres and justifying them—in contradiction to his manifesto—by declaring impious (takfir) all those Algerians who had not joined its ranks.
[95] According to journalist Graeme Wood in mid-2015, Following takfiri doctrine, the Islamic State is committed to purifying the world by killing vast numbers of people.