In The Name of Allah, The Most Merciful, The Bestower of Mercy.

Imam Muhammad Ibn Saaleh Uthaymeen [may Allah have mercy upon him] said, “There is no khurooj (rebellion, revolt) with the sword except that it is preceded by Khurooj with the tongue”. [Ref 1]

Al-Allaamah Saalih Al-Fawzan [may Allaah preserve him] said: “The khawaarij are of different types; among them are those who carry weapons, those who speak, those who write, and the one who believes in his heart, but he neither speaks nor does anything; however he has the belief of the khawaarij in his creed. But some of them are worse than others”. [Ref 2]

[1]Quoted by Shaikh Abdullaah Al-Bukhaari (may Allah preserve him) in ‘Sharh Fadl Ilm As-Salaf Alaa Ilm Al Khalaf- Audio Number 1. Questions & Answers section

[2] An Excerpt from “Al-Ijaabaat Al-Muhimmah Fil-Mashaakil Al-Mulimmah”. Pages: 10-11