حَدَّثَنِي مَالِكٌ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّهُ قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يُشِيرُ إِلَى الْمَشْرِقِ وَيَقُولُ ‏"‏ هَا إِنَّ الْفِتْنَةَ هَا هُنَا إِنَّ الْفِتْنَةَ هَا هُنَا مِنْ حَيْثُ يَطْلُعُ قَرْنُ الشَّيْطَانِ ‏"‏ ‏.‏

Malik related to me from Abdullah ibn Dinar that Abdullah ibnUmar said, "I saw the Messenger of Allah, may Allah bless him andgrant him peace, pointing at the east and saying, 'The cause ofdissension is here. The cause of dissension is here, from where thehelpers of shaytan arise.' " Translation Not Available

Book Ref: Muwatta Imam Malik Book 54 Hadith 1794
Web Ref:  Muwatta Imam Malik Book 54 Hadith 29