Sahih Muslim Book 1, Hadith Number 86.

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

Abu Huraira reported: The Messenger of Allah (may peace and blessings be upon him) observed: There came to you the people from Yemen; they are tender of hearts and mild of feelings, the understanding is Yemenite, the sagacity is Yemenite.