How can the consensus that all Companions are righteous be reconciled with some of them rebelling against the Imam, and what is the refutation against those who claim that Al-Sa'di and Al-Rasibi were among the Companions and were Kharijites, keeping in mind that Al-Bukhari did not mention "من" (who) in his chapter on the Kharijites?

Ibn Abbas's understanding that the Khawarij are not from among the Muhajireen and Ansar is correct. Al-Rasibi, Al-Sa'di, and other Khawarij are not from them; rather, they are from the origins of the Khawarij sect, which innovated in religion, opposed the Companions, declared them disbelievers, and rejected the ahadith. Ibn al-Athir mentioned that Harqus al-Sa'di became one of the Khawarij, and Ibn Hajar questioned his companionship. Abdullah ibn Wahb al-Rasibi lived during the Jahiliyyah, and no narration from the Prophet, peace be upon him, is known from him.

The apparent meaning of Abu Sa'id al-Khudri's statement, "There will emerge in this Ummah," suggests that the Khawarij are not part of it. However, other narrations use the wording, "There will emerge a people from my Ummah." Ibn Hajar mentioned that the narration from Abu Sa'id with the wording "from my Ummah" is weak. The preposition "fi" (in) can sometimes mean "min" (from), indicating origin or part of. Al-Nawawi holds that the word "min" implies they are part of the Ummah and not disbelievers, unlike "fi." Ibn Hajar reconciled the authentic narrations by stating that the Ummah in Abu Sa'id's hadith refers to the Ummah of positive response (those who accept Islam), while in other narrations, it refers to the Ummah of invitation (all humanity called to Islam).

Most of the Ahl al-Sunnah hold that the Khawarij are transgressors, and the rulings of Islam apply to them because they utter the two declarations of faith and observe the pillars of Islam. Their transgression lies in declaring Muslims disbelievers based on a corrupt interpretation. Scholars have unanimously agreed that the Khawarij, despite their deviance, are a sect among the Muslim sects. They permitted marriage to them and eating their slaughtered animals, and they are not considered disbelievers as long as they adhere to the core principles of Islam.