The ruling on killing one who separates from the community if he is not declared a disbeliever

Question:
He says: Honorable Shaykh, may Allah grant you success, is there evidence in the saying of the Prophet (peace and blessings be upon him) that one who separates from the community is to be killed even if he is not declared a disbeliever?

Answer:
Yes, if his separation from the community causes fitnah (trial, discord or temptation), such as carrying weapons and inciting people to rebel against the one in authority, then he is to be killed. However, if he separates from the community but does not engage in fighting and does not incite people, then he is left alone. But he is subject to severe warning: he has removed the bond of Islam from his neck and will die the death of the pre-Islamic age of ignorance, may Allah protect us from that. But if he causes fitnah (trial, discord or temptation) or incitement and carries weapons, then he is to be killed to prevent his harm. Yes.