Musnad Ahmad 30:1725

Sulayman narrated to us, Isma'il narrated to us, al-'Ala' informed me, from his father, from Abu Hurayrah, that the Prophet, peace and blessings of Allah be upon him, said: "Faith is Yemeni, and disbelief is toward the east. Tranquility is in the people of sheep, and pride and showing off are in the loud-voiced people, the people of horses and camels."