The following article, written by Shaykh Badr al-Badr al-'Anazy (hafidhahullah) is a concise compilation of some of the statements of the scholars regarding the Khawaarij, as well as a brief explanation of some of their names. This article was translated by our noble brother Abu Afnaan Muhammad 'Abdullah (hafidhahullah), who has explicit written permission from the Shaykh to translate his articles click here to read.
In this wonderfully informative yet concise article the Shaykh mentions a brief explanation of some of the many names of the khawarij throughout history e.g. Al-Harooriyyah, Ahl an-Nahrawaan, Al-Muhakkamah, Ash-Shurraah, Al-Maariqah.
An excerpt taken from the article ~
The scholars have stated that the hadeeth which have been narrated concerning deviant, misguided groups are all unauthentic except the ahaadeeth pertaining to the Khawaarij.
The Khawaarij are an evil people and they are the people of deceit and treachery. They killed the Leader of the Believers ‘Ali Ibn Abi Taalib treacherously and they wanted to kill Mu’aawiyah and ‘Amr Ibn al-‘Aas treacherously as well. However, Allah saved Mu’aawiyah and ‘Amr from them.
The scholars differ regarding the ruling related to the Khawaarij being disbelievers or not. There are two well-known opinions which Shaykh-ul-Islaam Ibn Taymiyyah attributed to al-Imaam Ahmad, and Ibn Hajar mentioned both in “Al-Fath”.