Sahih al-Bukhari 5303
Narrated Abu Masud:
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.
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، عَنْ إِسْمَاعِيلَ، عَنْ قَيْسٍ، عَنْ أَبِي مَسْعُودٍ، قَالَ وَأَشَارَ النَّبِيُّ صلى الله عليه وسلم بِيَدِهِ نَحْوَ الْيَمَنِ ‏
"‏ الإِيمَانُ هَا هُنَا ـ مَرَّتَيْنِ ـ أَلاَ وَإِنَّ الْقَسْوَةَ وَغِلَظَ الْقُلُوبِ فِي الْفَدَّادِينَ حَيْثُ يَطْلُعُ قَرْنَا الشَّيْطَانِ رَبِيعَةَ وَمُضَرَ ‏"‏‏.‏