It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The people of Yemen have come to you; they are the softest of hearts. Faith is Yemeni, understanding (fiqh) is Yemeni, and wisdom too is Yemeni."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1809