Sayyiduna Wathilah bin al-Asqa' (may Allah be pleased with him) says that he heard the Messenger of Allah (peace and blessings be upon him) say: "The Hour will not be established until ten signs appear: a sinking of the earth in the east, a sinking of the earth in the west, a sinking of the earth in the Arabian Peninsula, the emergence of the Dajjal, the descent of Isa bin Maryam (peace be upon him), the emergence of Ya'juj and Ma'juj, the emergence of the Beast of the Earth (Dabbat al-Ard), the rising of the sun from its west, and a fire that will come out of Ta'izz in Aden and drive the people to the place of Gathering, gathering together even the ants and the tiny ants."
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18415