Sahih Muslim 181
صحيح مسلم#181SahihIt is narrated on the authority of Ibn Mas'ud that the Messenger of Allah (may peace and blessings be upon him) pointed towards Yemen with his hand and said: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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 1:88