Sahih Muslim Book 1, Hadith Number 95.

Chapter : Precedence of the believers over one another and the superiority of the people of Yemen in this respect.

It 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.