Abu Mas’ud narrates that the Messenger of Allah (Allah bless him & give him peace) gestured with his hands towards Yemen and said: “Belief (iman) is there….”[saheeh Bukhari]
Abu Hurayra (Allah be pleased with him) narrates that the Messenger of Allah (Allah bless him & give him peace) said: “The people of Yemen have come to you and they are extremely gentle and soft-hearted. Belief (iman) is that of the Yemenis and wisdom (hikma) is that of the Yemenis. Pride and haughtiness are the characters of the owners of camels, and calmness and solemnity are the qualities of the owners of sheep.” [Sahih al-Bukhari]