Musnad Ahmad 32:1551

Hassan ibn Musa narrated to us, Shaiban narrated to us, from Yahya, from Ishaq ibn Abdullah ibn Abi Talha, from Anas ibn Malik, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The Dajjal will descend when he descends in a district of Medina, and it will shake three tremors. Then every disbeliever and hypocrite will go out to him."