I like how some people use the Hadith of Najd to basically make Takfeer on anyone they want from Najd, what if that "Horn of the devil" narration was talking about Musaylamah al-Kazzab? Since al-Yamamah the land of Musaylamah is basically in Najd, isn't more obvious that the "Horn of the devil" is Musaylamah and not basically the people of Najd?