Sahih Muslim 193
صحيح مسلم#193SahihIt is reported on the authority of Jabir b. Abdullah that the Messenger of Allah (may peace and, blessings be upon him) observed:The callousness of heart and sternness is in the East and faith is among the people of the Hijaz
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: 1:100