Sahih Muslim 181
صحيح مسلم#181Sahihحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو أُسَامَةَ، ح وَحَدَّثَنَا ابْنُ نُمَيْرٍ، حَدَّثَنَا أَبِي ح، وَحَدَّثَنَا أَبُو كُرَيْبٍ، حَدَّثَنَا ابْنُ إِدْرِيسَ، كُلُّهُمْ عَنْ إِسْمَاعِيلَ بْنِ أَبِي خَالِدٍ، ح وَحَدَّثَنَا يَحْيَى بْنُ حَبِيبٍ الْحَارِثِيُّ، - وَاللَّفْظُ لَهُ - حَدَّثَنَا مُعْتَمِرٌ، عَنْ إِسْمَاعِيلَ، قَالَ سَمِعْتُ قَيْسًا، يَرْوِي عَنْ أَبِي مَسْعُودٍ، قَالَ أَشَارَ النَّبِيُّ صلى الله عليه وسلم بِيَدِهِ نَحْوَ الْيَمَنِ فَقَالَ " أَلاَ إِنَّ الإِيمَانَ هَا هُنَا وَإِنَّ الْقَسْوَةَ وَغِلَظَ الْقُلُوبِ فِي الْفَدَّادِينَ عِنْدَ أُصُولِ أَذْنَابِ الإِبِلِ حَيْثُ يَطْلُعُ قَرْنَا الشَّيْطَانِ فِي رَبِيعَةَ وَمُضَرَ " .
It 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
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 1:88