Sahih Muslim 236
صحيح مسلم#236SahihIt is narrated on the authority of Anas that the Apostle (may peace and blessings be upon him) said:The love of the Ansar is the sign of faith and hatred against them is the sign of dissemblance
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: 1:142