Sahih Muslim 283
صحيح مسلم#283SahihIt is narrated on the authority of Abu Huraira that the Messenger of Allah (ﷺ) observed:He who took up arms against us is not of us and he who acted dishonestly towards us is not of us
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 1:189