Sahih Muslim Book 1, Hadith Number 92.

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

It is reporter on the authority of Abu Huraira that the Messenger of Allah (may peace and blessings be upon him) observed: There came the people of Yemen who are soft of hearts, tender in feelings: the belief is that of the Yemenites, the sagacity is that of the Yemenites and the summit of unbelief is towards the East.