It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "People from Yemen are coming to you who are gentle in temperament and soft-hearted. Faith is of the Yemenis, and wisdom is also Yemeni."
Hadith Referenceالسنن المأثورة / باب عمارة الأرضين / 428
Hadith Takhrijصحیح البخاری، المغازی، باب قدوم الاشعريين واهل اليمن، رقم: 4390، صحیح مسلم، الایمان، باب تفاضل اهل الايمان فيه رقم: 52