The Prophet ﷺ gestured with his hand toward Yemen and said, "Faith is Yemeni, right here. Indeed, harshness and hardness of heart are found among the loud-voiced camel herders at the base of the camels' tails, where the two horns of Satan rise, among Rabia and Mudar."
أشار النبي ﷺ بيده نحو اليمن فقال: الإيمان يمان هاهنا، ألا إن القسوة وغلظ القلوب في الفدادين عند أصول أذناب الإبل حيث يطلع قرنا الشيطان في ربيعة ومضر.
Bukhari narrated it in the Beginning of Creation (3302), and Muslim in the Book of Faith (51), both from the hadith of Ismail bin Abu Khalid, who said, "I heard Qais narrating from Uqbah bin Amr, Abu Masud," who then mentioned it.His saying, "al-Fadadeen," with the doubled dal, is the plural of "faddad," which comes from "al-fadeed," meaning a loud voice, that is, those whose voices rise over their camels, horses, crops, and the like.The meaning of his saying, "at the base of the tails of the camels," is those who have clamor and shouting when driving them.As for his saying, "where the two horns of Satan rise, among Rabia and Mudar," the phrase "among Rabia and Mudar" stands in place of "among the Fadadeen," meaning that harshness is found among the Fadadeen of Rabia and Mudar.His saying, "the two horns of Satan," refers to the two sides of his head, and what is meant by this is that the East is marked by an increased dominance of Satan and of disbelief, as stated in another hadith, "The head of disbelief lies toward the East," which will be mentioned from the hadith of Abu Hurairah. That was true in his own time ﷺ when he said it, and it will hold true again when Dajjal emerges from the East.This ends, in summary, from the words of Ibn Salah in Siyanat Sahih Muslim.