question #1 Sahih Muslim 51, Book 1, Hadith 88 : What is the significance of Yemen in the context of faith and belief in Islam?

Verily Iman is towards this side, and harshness and callousness of the hearts is found amongst the rude owners of the camels who drive them behind their tails (to the direction) where emerge the two horns of Satan, they are the tribes of Rabi’a and Mudar.