Extremist groups today call other Muslims unbelievers in order to kill them. The practice is called takfīr, and Muslim scholars have been warning against it since the first civil war, when the earliest group to practise it appeared in the army of the fourth caliph, Ali.
Here are the facts of its origin: who the first takfiris were, what the Prophet (peace be upon him) said about their type, and how the mainstream of Islam answered them then and answers their heirs now. The history is short, and it is useful because the arguments used today are the arguments used then.
Number 1: They left Ali's army
After the battle of Siffin in 657, Ali agreed to arbitration with Muawiya. The agreement came when Muawiya’s troops raised copies of the Quran on their spears and called for the book to decide between the two armies. A group in Ali’s army objected, saying “judgement belongs to God alone,”[1] and left, hence their name, the Khawārij (those who went out). At Nahrawan in 658 Ali defeated them.
They then held that both sides had become unbelievers by agreeing to human arbitration. They took their slogan from verses of the Quran that are true in themselves. Ali is reported to have answered that it was a true word used for a false purpose, and he pointed out that the Quran itself tells people to appoint arbiters in disputes.[2]
The decisive step was theirs: they turned a disagreement over a political decision into a charge of unbelief against fellow Muslims, among them the Prophet’s cousin and son-in-law. Sources record that before Nahrawan they had killed a man named Abd Allah ibn Khabbab, a companion’s son, and his wife, because he would not renounce Ali.[3] Takfir led to bloodshed at once.
Number 2: Ibn Abbas argued with them, and two thousand returned
Before Nahrawan, Ali sent his cousin Ibn Abbas to the Kharijites encamped at Harura, near Kufa. A report in al-Nasa’i’s Sunan al-Kubra gives their three objections: Ali had let men judge in a matter that belongs to God; he had fought at the Battle of the Camel and taken no captives or spoils, which they said was lawful if his opponents were unbelievers and forbidden if they were believers; and he had erased the title “Commander of the Believers” from the arbitration document.[4]
Ibn Abbas answered each one from the sources. The Quran gives the penalty for killing game in the sanctuary to two just men (5:95) and sends arbiters to a quarrelling couple (4:35), and saving blood is weightier than either. Aisha, whom the other side had fought at the Camel, is the mother of the believers by the Quran (33:6), so whoever takes her captive or denies her motherhood is in error. The Prophet had the words “Messenger of God” erased from the treaty of Hudaybiyya, and that did not remove his prophethood.
According to the report, two thousand of them went back, and the rest were fought at Nahrawan. The first answer to the takfiris was an argument from the text, offered before any sword was drawn.
Number 3: One of them killed Ali
In 661 a Kharijite named Ibn Muljam struck Ali with a poisoned sword as he went to the dawn prayer in Kufa. Ali died two days later. The group had claimed to act for God.

The historian al-Tabari reports that three Kharijites had agreed to kill Ali, Muawiya and the governor Amr ibn al-As on the same morning. Only the attack on Ali succeeded.[3] Ali is reported to have told his family to do no more to Ibn Muljam than to strike him once in return, and to forbid mutilation of the body.
Their other marks were harshness toward Muslims who differed and a readiness to declare major sinners unbelievers. The sources also describe them as unusually devout, with long prayers and much recitation of the Quran. Their piety shows that zeal is no protection against error.
Number 4: The Prophet described their type
The Prophet (peace be upon him) said that there would arise a people who recite the Quran “but it does not pass beyond their throats,” who “pass through the religion as an arrow passes through its game,” and whom those who fought them would be rewarded.[5] The early scholars applied the description to the Kharijites.
In the report the Prophet adds that his companions would think their own prayer and fasting small beside that of these people. The hadith appears in both Sahih collections, and it is among the best attested warnings in the Sunni tradition. Ali is reported to have cited it before Nahrawan.
It was taken as a warning about piety without understanding. The objection from today’s extremists is that the same hadith licenses fighting any group one judges to fit it. The classical answer is that the jurists applied the reward only to armed rebels who attacked the Muslim community, and Ali is reported to have declined to call even the Kharijites unbelievers, saying that they were brothers who had rebelled.[6]
Number 5: The mainstream refuses takfir for sin
The Prophet said: “If a man says to his brother ‘O unbeliever,’ it returns upon one of them.”[7] The standard creed of Sunni Islam, the Tahawi creed, says “We do not declare any of the people of the qibla to be unbelievers for a sin, as long as he does not hold it lawful.”[8] The qibla is the direction of prayer, so the phrase means those who pray as Muslims do.

The Kharijites had a verse to support them: “whoever does not judge by what God has revealed, those are the unbelievers.”[9] The companion Ibn Abbas is reported to have said of it that this is unbelief of a lesser kind, short of leaving the faith.[10] Al-Ghazali, in his treatise on the limits of unbelief, urged great caution in declaring anyone who prays toward Mecca an unbeliever.[11]
So a Muslim is an unbeliever only by clear and deliberate rejection of what is certain in the faith, and only a court of qualified judges may so rule. Later jurists added that the judge must establish that the person understood and was not under compulsion.
Ismail al Faruqi, in his essay on Islam in the Historical Atlas of the Religions of the World, describes how the first dispute was settled. The overwhelming majority of Muslims held that a grave sinner, whatever his moral state, is still a Muslim, and that only apostasy, the profession of a faith contrary to Islam or the denial of God and of his unity, removes a person from the community. The defeat of the Kharijites, he writes, meant the rejection of their doctrine of faith.[12]
Number 6: The modern scholars have restated it
In 2004 the Amman Message, signed by hundreds of scholars from every school, affirmed the validity of eight schools of Islam and forbade declaring any of their followers apostates.[13] The scholars gave it three rulings in 2005, and these were endorsed by assemblies of scholars from across the Muslim world.
In 2014 an open letter of 126 scholars to the leader of ISIS condemned the group’s takfir and violence.[14] It answered the group point by point from the Quran and hadith, and told it that it had no right to declare Muslims unbelievers or to kill them.
The Ibadis of Oman, who descend from the moderate wing of early Kharijism, reject extremism and follow tolerance. They themselves refuse the name Kharijite. Their example shows that a community descended from that movement can hold the rest of the Muslim world to be Muslim.
The bottom line
The first takfiris were pious men who rebelled over a political decision, branded the Prophet’s own family as unbelievers, and killed Ali at prayer. The Prophet had described their type in advance, and the mainstream answered them with a settled rule: no Muslim is declared an unbeliever for a sin, and the question belongs to qualified judges after proof.
Modern extremists reuse the same claim with the same result. The scholars of every school who have answered them have done so from the same sources, in the same terms. The long consensus against takfir is part of Islam, and the groups that kill in its name stand outside it.
Notes
- Quran 6:57; 12:40.
- Reports of Ali’s reply to the Kharijites, as in Sahih Muslim, Book of Zakat, and the early histories; on arbitration in the Quran, see 4:35 and 5:95. Sahih Muslim 1066g (Book of Zakat, “Exhortation to kill the Khawarij”), report of Ubayd Allah ibn Abi Rafi, in which Ali answers the cry “no command but God’s” with “a word of truth by which falsehood is intended”, checked on sunnah.com.
- Al-Tabari, Tarikh al-Rusul wa’l-Muluk, the accounts of Siffin, Nahrawan and the death of Ali.
- Al-Nasa’i, al-Sunan al-Kubra, no. 8575, report of Ibn Abbas on his debate with the Haruriyya (also in al-Tabarani, no. 10598, and al-Hakim, al-Mustadrak, no. 2656); graded hasan by Muqbil al-Wadi’i, al-Sahih al-Musnad, no. 694, as listed in the Dorar hadith encyclopaedia (read 23 October 2026). Quran 5:95; 4:35; 33:6.
- Sahih al-Bukhari, Book of Seeking Repentance from Apostates (chapter on killing the Khawarij); Sahih Muslim, Book of Zakat. Sahih al-Bukhari 6931 (Book of Apostates, “Killing the Khawarij”), report of Abu Said al-Khudri, and Sahih Muslim 1066a to 1066f, all checked on sunnah.com; Ibn Hajar al-Asqalani, Fath al-Bari (Salafiyya edition), vol. 12, p. 283 (Shamela text), for Bukhari 6931.
- Reports of Ali on the Kharijites, as given in later works of jurisprudence on rebels.
- Sahih al-Bukhari, Book of Manners (Adab). Sahih al-Bukhari 6104 (Book of Manners, “Whoever calls his brother a kafir without grounds”), report of Abdullah ibn Umar, checked on sunnah.com; Ibn Hajar al-Asqalani, Fath al-Bari (Salafiyya edition), vol. 10, p. 514 (Shamela text).
- Al-Tahawi, al-Aqida al-Tahawiyya.
- Quran 5:44.
- The saying of Ibn Abbas, “unbelief short of unbelief”, as recorded in the commentary of al-Tabari on Quran 5:44.
- Al-Ghazali, Faysal al-Tafriqa bayna al-Islam wa al-Zandaqa.
- Ismail R. al Faruqi, “Islam”, in Ismail Ragi A. al Faruqi (ed.) and David E. Sopher (map ed.), Historical Atlas of the Religions of the World (New York: Macmillan, 1974), p. 265.
- The Amman Message, 2004–2005, of King Abdullah II of Jordan, with the three fatwas endorsed by scholars of the schools.
- Open letter of 126 Muslim scholars to Abu Bakr al-Baghdadi, September 2014.





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