(42) باب قَوْلِ النَّبِيِّ - صلى الله تعالى عليه وسلم - " مَنْ حَمَل عَلَيْنَا السِّلاَحَ فَلَيْسَ مِنَّا "
It is narrated on the authority of Abu Musa Ash'ari:
He who took up arms against us is not of us.
Reference: Sahih Muslim 100
In-book reference: Book 1, Hadith 188
USC-MSA web (English) reference(deprecated numbering scheme): Book 1, Hadith 181