The relationship between Shaykh Muqbil and Shaykh Rabee’ was a tower of strength. They did not allow the people to separate them.
In the Name of Allaah, Ar-Rahmaan, Ar-Raheem...
Principles in the Salafee Manhaj in Dealing with Refutation and the Refuted One
Those Who it Is Permissible to Censure, Criticize, and Warn the People Against Their Harm:1
It is permissible, rather, it is obligatory to speak about the people of innovation and to warn against them and their innovation, individually or as a group; those from the past as well as the present, from the Khawaarij, the Rawaafidh, the Jahmiyyah, the Murji’ah, the Karaamiyyah, and the people of kalaam (theological rhetoric), those who the knowledge of kalaam has dragged them to corrupt beliefs like negation of (all of) Allaah’s attributes or some of them. So these, it is obligatory to warn against them and their books. Likewise, whoever traverses upon their (deviated) methodology from the present-day sects or groups and from those who outwardly profess tawheed and the sunnah. It is obligatory to have opposition to them and to avoid their methodologies. Rather, one must wage war against them and flee from them and their people. Included amongst them are those who aid them, defend them, mention their good qualities, praise them, and praise their personalities and leaders2, and show preference for their methodology over the methodology of the people of tawheed, the Sunnah, and the Jamaa’ah.
 كن سلفيا على الجادة
 This is if their condition and that which they have with them from opposition to the Sunnah is known.