What takes a Muslim out of the circle of the people of the Sunnah and the community?

Question:
Honorable Shaykh, may Allah grant you success. The questioner asks: What takes a Muslim out of the circle of the people of the Sunnah and the community?

Answer:
A person exits the circle of the people of the Sunnah and the community if he opposes the people of the Sunnah and the community in these principles. If he opposes the people of the Sunnah and the community in these principles, he begins to speak ill of the Companions and cast aspersions on them. He declares those who commit major sins, short of shirk (associating partners with Allah), to be disbelievers, and thus becomes one of the Khawarij. He kills Muslims, for the characteristic of the Khawarij is that they kill the people of faith and leave the people of idols alone. This is in the authentic hadith of the Messenger of Allah (peace and blessings be upon him) describing them as killing the people of faith and leaving the people of idols alone.
Therefore, you will not find the Khawarij throughout history fighting the disbelievers; rather, they fight the Muslims, may Allah protect us, because they have departed from the methodology of the people of the Sunnah and the community. Likewise, the Murji'ah have exited the methodology of the people of the Sunnah and the community. They are lax regarding sins and make them easy for people, saying that disobedience does not harm alongside faith. How can there be faith if disobedience does not harm it? Disobedience does harm. You call it disobedience? Disobedience, yes.