Sahih Bukhari
Virtues and Merits of the Prophet (pbuh) and his Companions
Volume: 004 / Book Number: 056 / Hadith Number: 714
Narrated 'Abdullah bin 'Umar:
I heard Allah's Apostle on the pulpit saying, "Verily, afflictions (will start) from here," pointing towards the east, "whence the side of the head of Satan comes out."