Sahih Muslim Book 41, Hadith Number 7040.

Abu Huraira reported Allah’s Messenger (may peace be upon him) as saying: Hasten in performing these good deeds (before these) six things (happen): (the appearance) of tribe Dijjal, the smoke, the beast of the earth, the rising of the sun from the west, the general turmoil (leading to large-scale massacre) and death of masses and individuals.