From Sahih Muslim (Hadith 7294):
Salim b. Abdullah reported on the authority of his father that Allah's Messenger (ﷺ), while turning his face towards the east, said:The turmoil would appear from this side; verily, the turmoil would appear from this side; verily, the turmoil would appear from this side - the side where appear the horns of Satan
Reference: Muslim 7294