Sahih Muslim 52dBook 1, Hadith 92
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " رَأْسُ الْكُفْرِ نَحْوَ الْمَشْرِقِ وَالْفَخْرُ وَالْخُيَلاَءُ فِي أَهْلِ الْخَيْلِ وَالإِبِلِ الْفَدَّادِينَ أَهْلِ الْوَبَرِ وَالسَّكِينَةُ فِي أَهْلِ الْغَنَمِ " .
The summit of unbelief is towards the East and the pride and conceitedness is found among the owners of horses and camels who are rude and uncivil, people of the tents, and tranquillity is found among those who rear goats and sheep.