Sahih al-Bukhari 7093
Sahih al-Bukhari · Book 92: Afflictions and the End of the World · “Al-Fitnah will appear from the east.”
Narrated Ibn `Umar:
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ ، حَدَّثَنَا لَيْثٌ ، عَنْ نَافِعٍ ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّهُ سَمِعَ رَسُولَ اللَّهِ صلى الله عليه وسلم وَهْوَ مُسْتَقْبِلٌ الْمَشْرِقَ يَقُولُ " أَلاَ إِنَّ الْفِتْنَةَ هَا هُنَا مِنْ حَيْثُ يَطْلُعُ قَرْنُ الشَّيْطَانِ " .
I heard Allah's Messenger (ﷺ) while he was facing the East, saying, "Verily! Afflictions are there, from where the side of the head of Satan comes out."