I have received your message in which you informed me about a book issued by a Sheikh of the Ibadhiyyah (a Muslim sect) in Algeria entitled "Kharijites are the supporters of `Aly" (may Allah be pleased with him), which made you suspect many of the facts you previously believed. In this regard, I inform you that the Kharijites were not the supporters of Imam `Aly; rather, they were his opponents. He fought against and killed a large number of them. They accused him of apostasy and considered it lawful to kill him (may Allah be pleased with him). Imam `Aly was killed by Ibn Muljim, who was one of them. The Kharijites were a wicked sect who considered a Muslim who commits sins to be a Kafir (disbeliever). They opined that disobedient Muslims will abide in Hellfire forever and that they will not come out of it; the same as disbelievers. The Prophet (peace be upon him) warned us against them and told us that they quickly pass through (the teachings of) Islam just like an arrow passes through prey. Abu Hurayrah (may Allah be pleased with him) was upright and trustworthy as other Companions (may Allah be pleased with them), according to the viewpoint of Ahl Al­Sunnah wal­Jama`ah (those adhering to the Sunnah and the Muslim community). Moreover, he was the Companion who memorized most of the Hadiths of Allah's Messenger (peace be upon him). Neither `Umar nor any other Companion accused him of belying. Rather, they quoted his Hadiths as evidence and acted in accordance with them. Thus, the mentioned author has committed a great sin by telling lies about the Companions (may Allah be pleased with them). Accordingly, one cannot depend on him or his book. This book should be burnt, if the case is as you have mentioned.