The Prophet (ﷺ) pointed with his hand towards Yemen and said twice, "Faith is there," and then pointed
towards the East, and said, "Verily, sternness and mercilessness are the qualities of those who are busy
with their camels and pay no attention to their religion, where the two sides of the head of Satan will
appear," namely, the tribes of Rabl'a and Muqar.
Sahih al-Bukhari Book 68, Hadith 52